diff --git a/translations/README-ar.md b/translations/README-ar.md
index 681ccd9..37dd36b 100644
--- a/translations/README-ar.md
+++ b/translations/README-ar.md
@@ -1,6 +1,6 @@
 # الإعداد لجوجل
 
-الترجمه: 
+الترجمه:
 - [中文版本](translations/README-cn.md)
 - الترجمات تحت الاعداد:
     - [Español](https://github.com/jwasham/google-interview-university/issues/80)
@@ -175,7 +175,7 @@
 
 **اصنع مسار جديد يمكن من خلاله أن تضع علامة [x]**
 
-    احصل على نسخة خاصة "fork" بك واتبع هذه الأوامر 
+    احصل على نسخة خاصة "fork" بك واتبع هذه الأوامر
 
 `git checkout -b progress`
 
@@ -215,7 +215,7 @@ Print out a "[future Googler](https://github.com/jwasham/google-interview-univer
 قصتي: [Why I Studied Full-Time for 8 Months for a Google Interview](https://medium.com/@googleyasheck/why-i-studied-full-time-for-8-months-for-a-google-interview-cc662ce9bb13)
 
 I'm on the journey, too. Follow along:
- 
+
 
 - **المدونة**: [GoogleyAsHeck.com](https://googleyasheck.com)
 - تويتر: [@googleyasheck](https://twitter.com/googleyasheck)
@@ -359,7 +359,7 @@ If short on time:
         - Chapter 7 - Composite Data Types and Memory Objects
         - Chapter 9 - CPU Architecture
         - Chapter 10 - Instruction Set Architecture
-        - Chapter 11 - Memory Architecture and Organization 
+        - Chapter 11 - Memory Architecture and Organization
 
 If you have more time (I want this book):
 
@@ -380,7 +380,7 @@ If you have more time (I want this book):
 
 I haven't read these two, but they are highly rated and written by Sedgewick. He's awesome.
 
-- [ ] [Algorithms in C++, Parts 1-4: Fundamentals, Data Structure, Sorting, Searching](https://www.amazon.com/Algorithms-Parts-1-4-Fundamentals-Structure/dp/0201350882/) 
+- [ ] [Algorithms in C++, Parts 1-4: Fundamentals, Data Structure, Sorting, Searching](https://www.amazon.com/Algorithms-Parts-1-4-Fundamentals-Structure/dp/0201350882/)
 - [ ] [Algorithms in C++ Part 5: Graph Algorithms](https://www.amazon.com/Algorithms-Part-Graph-3rd-Pt-5/dp/0201361183/)
 
 If you have a better recommendation for C++, please let me know. Looking for a comprehensive resource.
@@ -452,7 +452,7 @@ OR:
       that is just an intro. This a guidebook on program design and architecture, much like Code Complete, but much shorter.
 
 - ~~"Algorithms and Programming: Problems and Solutions" by Shen~~
-    - A fine book, but after working through problems on several pages I got frustrated with the Pascal, do while loops, 1-indexed arrays, and unclear post-condition satisfaction results. 
+    - A fine book, but after working through problems on several pages I got frustrated with the Pascal, do while loops, 1-indexed arrays, and unclear post-condition satisfaction results.
     - Would rather spend time on coding problems from another book or online coding problems.
 
 
@@ -480,7 +480,7 @@ OR:
 اصنع واحدا منها لك مجانا:
 
 - [Flashcards site repo](https://github.com/jwasham/computer-science-flash-cards)
-- [My flash cards database (old - 1200 cards)](https://github.com/jwasham/computer-science-flash-cards/blob/master/cards-jwasham.db): 
+- [My flash cards database (old - 1200 cards)](https://github.com/jwasham/computer-science-flash-cards/blob/master/cards-jwasham.db):
 - [My flash cards database (new - 1800 cards)](https://github.com/jwasham/computer-science-flash-cards/blob/master/cards-jwasham-extreme.db):
 
 Keep in mind I went overboard and have cards covering everything from assembly language and Python trivia to machine learning and statistics. It's way too much for what's required by Google.
@@ -489,7 +489,7 @@ Keep in mind I went overboard and have cards covering everything from assembly l
 same card and answer it several times correctly before you really know it. Repetition will put that knowledge deeper in
 your brain.
 
-An alternative to using my flashcard site is [Anki](http://ankisrs.net/), which has been recommended to me numerous times. It uses a repetition system to help you remember. 
+An alternative to using my flashcard site is [Anki](http://ankisrs.net/), which has been recommended to me numerous times. It uses a repetition system to help you remember.
 It's user-friendly, available on all platforms and has a cloud sync system. It costs $25 on iOS but is free on other platforms.
 
 My flashcard database in Anki format: https://ankiweb.net/shared/info/25173560 (thanks [@xiewenya](https://github.com/xiewenya))
@@ -548,9 +548,9 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 - [ ] **Learn C**
     - C is everywhere. You'll see examples in books, lectures, videos, *everywhere* while you're studying.
     - [ ] [C Programming Language, Vol 2](https://www.amazon.com/Programming-Language-Brian-W-Kernighan/dp/0131103628)
-        - This is a short book, but it will give you a great handle on the C language and if you practice it a little 
+        - This is a short book, but it will give you a great handle on the C language and if you practice it a little
             you'll quickly get proficient. Understanding C helps you understand how programs and memory work.
-        - [answers to questions](https://github.com/lekkas/c-algorithms) 
+        - [answers to questions](https://github.com/lekkas/c-algorithms)
 
 - [ ] **How computers process a program:**
     - [ ] [How does CPU execute program (video)](https://www.youtube.com/watch?v=42KTvGYQYnA)
@@ -587,12 +587,12 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [Multi-dim (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [Resizing arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -654,14 +654,14 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -688,10 +688,10 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [Using Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [Supporting Hashing (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [Language Support Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -1193,15 +1193,15 @@ You'll get more graph practice in Skiena's book (see Books section below) and th
         - [ ] [4. Boyer-Moore](https://www.youtube.com/watch?v=fI7Ch6pZXfM&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66&index=2)
         - [ ] [5. Rabin-Karp](https://www.youtube.com/watch?v=QzI0p6zDjK4&index=1&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66)
     - [ ] [Search pattern in text (video)](https://www.coursera.org/learn/data-structures/lecture/tAfHI/search-pattern-in-text)
-    
+
     If you need more detail on this subject, see "String Matching" section in [Additional Detail on Some Subjects](#additional-detail-on-some-subjects)
 
 ---
 
 ## System Design, Scalability, Data Handling
 - **You can expect system design questions if you have 4+ years of experience.**
-- Scalability and System Design are very large topics with many topics and resources, since 
-      there is a lot to consider when designing a software/hardware system that can scale. 
+- Scalability and System Design are very large topics with many topics and resources, since
+      there is a lot to consider when designing a software/hardware system that can scale.
       Expect to spend quite a bit of time on this.
 - Considerations from Yegge:
     - scalability
@@ -2030,4 +2030,3 @@ Sit back and enjoy. "Netflix and skill" :P
 
 - [Directory of Online CS Courses](https://github.com/open-source-society/computer-science)
 - [Directory of CS Courses (many with online lectures)](https://github.com/prakhar1989/awesome-courses)
-
diff --git a/translations/README-cn.md b/translations/README-cn.md
index 19b3c09..73521ab 100644
--- a/translations/README-cn.md
+++ b/translations/README-cn.md
@@ -354,11 +354,11 @@
     - 实现一个可自动调整大小的动态数组。
     - [ ] 介绍：
         - [数组（视频）](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
-        - [数组的基础知识（视频）](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [多维数组（视频）](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [数组的基础知识（视频）](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [多维数组（视频）](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [动态数组（视频）](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
-        - [不规则数组（视频）](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [调整数组的大小（视频）](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [不规则数组（视频）](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [调整数组的大小（视频）](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] 实现一个动态数组（可自动调整大小的可变数组）：
         - [ ] 练习使用数组和指针去编码，并且指针是通过计算去跳转而不是使用索引
         - [ ] 通过分配内存来新建一个原生数据型数组
@@ -418,14 +418,14 @@
 
 - ### 堆栈（Stack）
     - [ ] [堆栈（视频）](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [使用堆栈 —— 后进先出（视频）](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [使用堆栈 —— 后进先出（视频）](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] 可以不实现，因为使用数组来实现并不重要
 
 - ### 队列（Queue）
-    - [ ] [使用队列 —— 先进先出（视频）](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [使用队列 —— 先进先出（视频）](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [队列（视频）](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [原型队列/先进先出（FIFO）](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [优先级队列（视频）](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [优先级队列（视频）](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] 使用含有尾部指针的链表来实现:
         - enqueue(value) —— 在尾部添加值
         - dequeue() —— 删除最早添加的元素并返回其值（首部元素）
@@ -451,10 +451,10 @@
         - [ ] [（进阶）完美哈希（Perfect hashing）（视频）](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] 在线课程：
-        - [ ] [哈希函数的掌握（视频）](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [使用哈希表（视频）](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [哈希表的支持（视频）](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [哈希表的语言支持（视频）](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [哈希函数的掌握（视频）](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [使用哈希表（视频）](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [哈希表的支持（视频）](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [哈希表的语言支持（视频）](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [基本哈希表（视频）](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [数据结构（视频）](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [电话薄问题（Phone Book Problem）（视频）](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
diff --git a/translations/README-es.md b/translations/README-es.md
index 08ec2e9..f84576d 100644
--- a/translations/README-es.md
+++ b/translations/README-es.md
@@ -508,12 +508,12 @@ Escriba código en un pizarrón o en papel no en la computadora. Pruebe con algu
     - [ ] Descripción:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [Multi-dim (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [Resizing arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implemente un vector (Arreglo mutable con redimensionamiento automático):
         - [ ] Practique codificar usando arreglos y apuntadores, y un apuntador matemático para saltar a un índice en lugar de utilizar la indexación.
         - [ ] Nueva arreglo de información primaria con memoria asignada
@@ -574,14 +574,14 @@ Escriba código en un pizarrón o en papel no en la computadora. Pruebe con algu
         - No es necesario
 - ### Pila
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] No implementaré. Implementando con arreglos es trivial.
 
 - ### Cola o fila
-    - [ ] [Using Queues First-In First-Out(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implementar usando listas enlazadas, con el puntero de la cola:
         - enqueue(value) – Añade el valor en la posición de la cola
         - dequeue() – Regresa el valor y elimina el valor más recientemente añadido(frontal)
@@ -608,10 +608,10 @@ Escriba código en un pizarrón o en papel no en la computadora. Pruebe con algu
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Cursos en línea:
-        - [ ] [Understanding Hash Functions (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [Using Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [Supporting Hashing (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [Language Support Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
diff --git a/translations/README-fr.md b/translations/README-fr.md
index 720e775..219cefa 100644
--- a/translations/README-fr.md
+++ b/translations/README-fr.md
@@ -573,12 +573,12 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [Multi-dim (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [Resizing arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -640,14 +640,14 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -674,10 +674,10 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [Using Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [Supporting Hashing (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [Language Support Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
diff --git a/translations/README-he.md b/translations/README-he.md
index 3daf08d..d4192f5 100644
--- a/translations/README-he.md
+++ b/translations/README-he.md
@@ -567,12 +567,12 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [Multi-dim (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [Resizing arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -634,14 +634,14 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -668,10 +668,10 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [Using Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [Supporting Hashing (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [Language Support Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
diff --git a/translations/README-hi.md b/translations/README-hi.md
index 087cc8b..33ae4c9 100644
--- a/translations/README-hi.md
+++ b/translations/README-hi.md
@@ -413,11 +413,11 @@ memory" का एरर न दे, और तब मुजे कोई वै
     - एक स्वचालित रीसाइज़िंग वेक्टर को लागू करें
     - [ ] विवरण:
         - [एरे  (विडियो)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
-        - [Basic Arrays (विडियो)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [Multi-dim (विडियो)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [Basic Arrays (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [Multi-dim (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (विडियो)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
-        - [Jagged Arrays (विडियो)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [Resizing arrays (विडियो)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [Jagged Arrays (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [Resizing arrays (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -479,14 +479,14 @@ memory" का एरर न दे, और तब मुजे कोई वै
 
 - ### Stack
     - [ ] [Stacks (विडियो)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (विडियो)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [Using Stacks Last-In First-Out (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(विडियो)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [Using Queues First-In First-Out(विडियो)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (विडियो)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (विडियो)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [Priority Queues (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -513,10 +513,10 @@ memory" का एरर न दे, और तब मुजे कोई वै
         - [ ] [(Advanced) Perfect hashing (विडियो)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
     
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (विडियो](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [Using Hash Tables (विडियो)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [Supporting Hashing (विडियो)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [Language Support Hash Tables (विडियो)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [Understanding Hash Functions (विडियो](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [Using Hash Tables (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [Supporting Hashing (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [Language Support Hash Tables (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (विडियो)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (विडियो)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (विडियो)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
diff --git a/translations/README-id.md b/translations/README-id.md
index de298c9..c1e4f51 100644
--- a/translations/README-id.md
+++ b/translations/README-id.md
@@ -539,12 +539,12 @@ Menulis kode pada papan tulis atau kertas, bukan komputer. Uji dengan beberapa s
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [Multi-dim (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [Resizing arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -606,14 +606,14 @@ Menulis kode pada papan tulis atau kertas, bukan komputer. Uji dengan beberapa s
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -640,10 +640,10 @@ Menulis kode pada papan tulis atau kertas, bukan komputer. Uji dengan beberapa s
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [Using Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [Supporting Hashing (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [Language Support Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
diff --git a/translations/README-ko.md b/translations/README-ko.md
index 5a91bde..e67251d 100644
--- a/translations/README-ko.md
+++ b/translations/README-ko.md
@@ -617,12 +617,12 @@ Anki format의 내 flashcard 데이터베이스: https://ankiweb.net/shared/info
     - [ ] 설명:
         - [배열 (영상)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - 선형과 다차원 배열 (영상)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [배열 기본 (영상)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [다차원 배열 (영상)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [배열 기본 (영상)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [다차원 배열 (영상)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [동적 배열 (영상)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [가변 배열 (영상)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [가변 배열 (영상)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [배열 리사이징 (영상)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [가변 배열 (영상)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [배열 리사이징 (영상)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] 벡터 구현하기 (자동 리사이징을 포함한 동적 배열):
         - [ ] 배열, 포인터 및 인덱싱 대신하여 특정 인덱스에 접근하는 포인터 연산을 통한 코딩 연습
         - [ ] 메모리 할당을 포함한 새 배열
@@ -684,14 +684,14 @@ Anki format의 내 flashcard 데이터베이스: https://ankiweb.net/shared/info
 
 - ### 스택
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### 큐
-    - [ ] [Using Queues First-In First-Out(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -718,10 +718,10 @@ Anki format의 내 flashcard 데이터베이스: https://ankiweb.net/shared/info
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [Using Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [Supporting Hashing (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [Language Support Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
diff --git a/translations/README-pl.md b/translations/README-pl.md
index d356d33..d65d90c 100644
--- a/translations/README-pl.md
+++ b/translations/README-pl.md
@@ -525,12 +525,12 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [Multi-dim (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [Resizing arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -592,14 +592,14 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -626,10 +626,10 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [Using Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [Supporting Hashing (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [Language Support Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
diff --git a/translations/README-ptbr.md b/translations/README-ptbr.md
index abf3cd4..c69a7b5 100644
--- a/translations/README-ptbr.md
+++ b/translations/README-ptbr.md
@@ -519,12 +519,12 @@ Escreva código em um quadro branco ou papel, não em um computador. Teste com u
     - [ ] Descrição:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s) (Arrays lineares e multidimensionais - vídeo)
-        - [Basic Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html) (Arrays básicos - vídeo)
-        - [Multi-dim (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html) (Multidimensionais - vídeo)
+        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4) (Arrays básicos - vídeo)
+        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4) (Multidimensionais - vídeo)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays) (Arrays Dinâmicos - vídeo)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g) (Arrays Multidimensionais - vídeo)
-        - [Jagged Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html) (Arrays Multidimensionais - vídeo)
-        - [Resizing arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html) (Arrays Dinâmicos)
+        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4) (Arrays Multidimensionais - vídeo)
+        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4) (Arrays Dinâmicos)
     - [ ] Implementar um vetor (array mutável com redimensionamento automático):
         - [ ] Praticar programação usando arrays e ponteiros, e matemática de ponteiros para pular para um índice ao invés de usar indexação.
         - [ ] novo array de dados brutos com memória alocada
@@ -587,14 +587,14 @@ Escreva código em um quadro branco ou papel, não em um computador. Teste com u
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html) (Usando Stacks Último a Entrar Primeiro a Sair - vídeo)
+    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4) (Usando Stacks Último a Entrar Primeiro a Sair - vídeo)
     - [ ] Não implementarei. Implementar com array é trivial.
 
 - ### Queue (Fila)
-    - [ ] [Using Queues First-In First-Out(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html) (Usando queues FIFO(Primeiro a entrar, último a sair) - vídeo)
+    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4) (Usando queues FIFO(Primeiro a entrar, último a sair) - vídeo)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer) (Buffer circular/Primeiro a entrar, último a sair)
-    - [ ] [Priority Queues (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html) (Queues com Prioridade - vídeo)
+    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4) (Queues com Prioridade - vídeo)
     - [ ] Implementar usando lista ligada, com ponteiro de cauda (aponta para o último elemento de uma lista):
         - enqueue(valor) - adiciona "valor" na posição na cauda (final da lista)
         - dequeue() - retorna um valor e remove o elemento menos recentemente adicionado (início da lista))
@@ -621,10 +621,10 @@ Escreva código em um quadro branco ou papel, não em um computador. Teste com u
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4) ((Avançado) Hashing perfeito - vídeo)
 
     - [ ] Cursos Online:
-        - [ ] [Understanding Hash Functions (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html) (Compreendendo Funções Hash - vídeo)
-        - [ ] [Using Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html) (Usando Tabelas Hash - vídeo)
-        - [ ] [Supporting Hashing (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html) (Hashing de Suporte - vídeo)
-        - [ ] [Language Support Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html) (Tabelas Hash de Suporte de Linguagem - vídeo)
+        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4) (Compreendendo Funções Hash - vídeo)
+        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4) (Usando Tabelas Hash - vídeo)
+        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4) (Hashing de Suporte - vídeo)
+        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4) (Tabelas Hash de Suporte de Linguagem - vídeo)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables) (Fundamentos de Tabelas Hash - vídeo)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3) (Estruturas de Dados - vídeo)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem) (Problema da Lista Telefônica (vídeo) )
diff --git a/translations/README-th.md b/translations/README-th.md
index 508a165..4b8a3f8 100644
--- a/translations/README-th.md
+++ b/translations/README-th.md
@@ -498,12 +498,12 @@ There are a lot of distractions that can take up valuable time. Focus and concen
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [Multi-dim (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [Resizing arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -565,14 +565,14 @@ There are a lot of distractions that can take up valuable time. Focus and concen
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -599,10 +599,10 @@ There are a lot of distractions that can take up valuable time. Focus and concen
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [Using Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [Supporting Hashing (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [Language Support Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
diff --git a/translations/README-uk.md b/translations/README-uk.md
index d4ac163..9f65299 100644
--- a/translations/README-uk.md
+++ b/translations/README-uk.md
@@ -496,12 +496,12 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [Multi-dim (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [Resizing arrays (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -563,14 +563,14 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -597,10 +597,10 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [Using Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [Supporting Hashing (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [Language Support Hash Tables (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
diff --git a/translations/README-vi.md b/translations/README-vi.md
index 5585363..cc4ed15 100644
--- a/translations/README-vi.md
+++ b/translations/README-vi.md
@@ -535,12 +535,12 @@ Hãy viết code trên bảng đen hoặc trên giấy. Đừng sử dụng máy
     - [ ] Miêu tả, tên gốc được giữ nguyên kèm với bản dịch sang tiếng Việt:
         - [Arrays - Mảng (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays - Mảng tuyến tính và mảng đa chiều(video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays - Mảng cơ bản (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Basic-arrays/149042/177104-4.html)
-        - [Multi-dim - Đa chiều(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Multidimensional-arrays/149042/177105-4.html)
+        - [Basic Arrays - Mảng cơ bản (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
+        - [Multi-dim - Đa chiều(video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays - Mảng tùy biến (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays - Mảng trong mảng (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays - Mảng trong mảng (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Jagged-arrays/149042/177106-4.html)
-        - [Resizing arrays - Mảng có thể tùy biến kích thước (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Resizable-arrays/149042/177108-4.html)
+        - [Jagged Arrays - Mảng trong mảng (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
+        - [Resizing arrays - Mảng có thể tùy biến kích thước (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Cấp phát vector (Mảng có thể thay đổi với khả năng tự điều chỉnh kích cỡ):
         - [ ] Tập sử dụng mảng và con trỏ, dùng phép toán con trỏ để nhảy tới một chỉ mục (index) thay vì sử dụng chỉ mục.
         - [ ] Tạo mảng mới với vùng nhớ được cấp phát sẵn
@@ -602,14 +602,14 @@ Hãy viết code trên bảng đen hoặc trên giấy. Đừng sử dụng máy
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out - Sử dụng stack Vào-Cuối-Ra-Trước (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-stacks-last-first-out/149042/177120-4.html)
+    - [ ] [Using Stacks Last-In First-Out - Sử dụng stack Vào-Cuối-Ra-Trước (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Sẽ không cài đặt. Cài đặt với mảng là điều hiển nhiên.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out -  Sử dụng hàng đợi Vào-Trước-Ra-Trước(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-queues-first-first-out/149042/177122-4.html)
+    - [ ] [Using Queues First-In First-Out -  Sử dụng hàng đợi Vào-Trước-Ra-Trước(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues - Hàng đợi ưu tiên (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Priority-queues-deques/149042/177123-4.html)
+    - [ ] [Priority Queues - Hàng đợi ưu tiên (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Cài đặt sử dụng danh sách liên kết, áp dụng con trỏ đuôi:
         - enqueue(value) - Thêm giá trị ở đuôi
         - dequeue() - Trả về giá trị của dữ liệu được thêm vào xa nhất (thông thường là dữ liệu đầu tiên trong danh sách)
@@ -634,10 +634,10 @@ Hãy viết code trên bảng đen hoặc trên giấy. Đừng sử dụng máy
         - [ ] [(Advanced) Randomization: Universal & Perfect Hashing (video)](https://www.youtube.com/watch?v=z0lJ2k0sl1g&list=PLUl4u3cNGP6317WaSNfmCvGym2ucw3oGp&index=11)
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
     - [ ] Các khóa học online:
-        - [ ] [Understanding Hash Functions - Hiểu hàm băm (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Understanding-hash-functions/149042/177126-4.html)
-        - [ ] [Using Hash Tables - Sử dụng bảng băm (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Using-hash-tables/149042/177127-4.html)
-        - [ ] [Supporting Hashing - Hỗ trợ băm(video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Supporting-hashing/149042/177128-4.html)
-        - [ ] [Language Support Hash Tables - Ngôn ngữ hỗ trợ bảng băm (video)](https://www.lynda.com/Developer-Programming-Foundations-tutorials/Language-support-hash-tables/149042/177129-4.html)
+        - [ ] [Understanding Hash Functions - Hiểu hàm băm (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
+        - [ ] [Using Hash Tables - Sử dụng bảng băm (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
+        - [ ] [Supporting Hashing - Hỗ trợ băm(video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
+        - [ ] [Language Support Hash Tables - Ngôn ngữ hỗ trợ bảng băm (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables - Cơ bản về bảng băm (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures - Cấu trúc dữ liệu (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem - Vấn đề sổ điện thoại (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)