refactor: first four section, organize cont.

02-write-your-first-program/exercises/01-print-names/main.go

@@ -8,7 +8,8 @@
 package main
 
 // ---------------------------------------------------------
-// EXERCISE
+// EXERCISE: Print names
+//
 //  Print your name and your best friend's name using
 //  Println twice
 //

02-write-your-first-program/exercises/02-print-gopath/exercise.md

@@ -1,5 +1,6 @@
 // ---------------------------------------------------------
-// EXERCISE
+// EXERCISE: Print GOPATH
+//
 //  Print your GOPATH using `go env` tool
 //
 // EXPECTED OUTPUT

02-write-your-first-program/exercises/README.md

@@ -1,6 +1,6 @@
-1. **Print your name and your best friend's name** using Println twice. [Check out this exercise here](https://github.com/inancgumus/learngo/tree/master/02-write-your-first-program/exercises/01).
+1. **Print your name and your best friend's name** using Println twice. [Check out this exercise here](https://github.com/inancgumus/learngo/tree/master/02-write-your-first-program/exercises/01-print-names).
 
-2. **Print your GOPATH** using `go env` tool. [Check out this exercise here](https://github.com/inancgumus/learngo/tree/master/02-write-your-first-program/exercises/02).
+2. **Print your GOPATH** using `go env` tool. [Check out this exercise here](https://github.com/inancgumus/learngo/tree/master/02-write-your-first-program/exercises/02-print-gopath).
 
 3. **Say hello to yourself.**
 

03-packages-and-scopes/exercises/README.md

@@ -0,0 +1,13 @@
+1. **[Use your own package](https://github.com/inancgumus/learngo/tree/master/03-packages-and-scopes/exercises/01-packages)**
+
+    Create a few Go files and call their functions from the main function.
+
+
+2. **[Try the scopes](https://github.com/inancgumus/learngo/tree/master/03-packages-and-scopes/exercises/02-scopes)**
+
+    Learn the effects of scoping across packages.
+
+
+3. **[Rename imports](https://github.com/inancgumus/learngo/tree/master/03-packages-and-scopes/exercises/03-importing)**
+
+    Import the same package using a different name.

04-statements-expressions-comments/exercises/README.md

@@ -0,0 +1,23 @@
+1. **[Shy Semicolons](https://github.com/inancgumus/learngo/tree/master/04-statements-expressions-comments/exercises/01-shy-semicolons)**
+
+    Observe how Go fixes semicolons for you.
+
+2. **[Naked Expression](https://github.com/inancgumus/learngo/tree/master/04-statements-expressions-comments/exercises/01-shy-semicolons)**
+
+    Observe what happens when you use an expression without a statement.
+
+3. **[Operators Combine](https://github.com/inancgumus/learngo/tree/master/04-statements-expressions-comments/exercises/03-operators-combine)**
+
+    Try using operators to combine expressions.
+
+4. **[Print Go Version](https://github.com/inancgumus/learngo/tree/master/04-statements-expressions-comments/exercises/04-print-go-version)**
+
+    Use a package from Go Standard Library to print the current version of Go on your system. Or the system which will run your program.
+
+5. **[Comment Out](https://github.com/inancgumus/learngo/tree/master/04-statements-expressions-comments/exercises/05-comment-out)**
+
+    Learn how to comment out.
+
+6. **[Use the GoDoc](https://github.com/inancgumus/learngo/tree/master/04-statements-expressions-comments/exercises/06-use-godoc)**
+
+    Try godoc yourself.