diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.md
index 6c47fd4cc1..fc141892fc 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.md
@@ -64,7 +64,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -78,7 +78,7 @@ assert(
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL">
   </form>
 </main>
@@ -91,7 +91,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -105,7 +105,7 @@ assert(
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL">
     <button type="submit">Submit</button>
   </form>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.md
index f1fa576fb0..8712c40d56 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.md
@@ -64,7 +64,7 @@ assert($('input[type=text]').length > 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -89,7 +89,7 @@ assert($('input[type=text]').length > 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.md
index 4a2846b7b6..86ba598725 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.md
@@ -44,7 +44,7 @@ assert($('input[type="checkbox"]').prop('checked'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -58,7 +58,7 @@ assert($('input[type="checkbox"]').prop('checked'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving"> Loving</label>
@@ -77,7 +77,7 @@ assert($('input[type="checkbox"]').prop('checked'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -91,7 +91,7 @@ assert($('input[type="checkbox"]').prop('checked'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md
index 28c69358ba..7d018825d1 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md
@@ -77,7 +77,7 @@ assert($('ul li').filter((_, item) => !$(item).text().trim()).length === 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
   <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
@@ -91,7 +91,7 @@ assert($('ul li').filter((_, item) => !$(item).text().trim()).length === 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <ul>
     <li>milk</li>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.md
index e2b97f2f85..9a72fd9fd4 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.md
@@ -76,7 +76,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -90,7 +90,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <input type="text" placeholder="cat photo URL" required>
@@ -106,7 +106,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -120,7 +120,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label for="playful"><input id="playful" type="checkbox" name="personality">Playful</label>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md
index 7141a14b73..e69a72f891 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md
@@ -108,7 +108,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -122,7 +122,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL" required>
     <button type="submit">Submit</button>
   </form>
@@ -136,7 +136,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -150,7 +150,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
    <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <input type="text" placeholder="cat photo URL" required>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md
index 8c122c85db..379f71180b 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md
@@ -42,7 +42,7 @@ assert($('input[type=text]').length > 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -68,7 +68,7 @@ assert($('input[type=text]').length > 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.md
index bd4be8849c..00478ca09a 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.md
@@ -119,7 +119,7 @@ $('ol li').each((i, val) =>
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -139,7 +139,7 @@ $('ol li').each((i, val) =>
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.md
index 133a98d88b..41c608039e 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.md
@@ -85,9 +85,9 @@ assert($('footer').eq(0).attr('id') == 'footer');
 <h2>CatPhotoApp</h2>
 <main>
 
-  <a href="https://freecatphotoapp.com" target="_blank">cat photos</a>
+  <a href="https://www.freecatphotoapp.com" target="_blank">cat photos</a>
 
-  <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
+  <img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
 
   <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
   <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
@@ -107,7 +107,7 @@ assert($('footer').eq(0).attr('id') == 'footer');
 
   <a href="#footer">Jump to Bottom</a>
 
-  <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
+  <img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
 
   <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
   <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md
index 68993bddc3..01bdb478d5 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md
@@ -59,7 +59,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -74,7 +74,7 @@ assert(
     <li>other cats</li>
   </ol>
 
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
@@ -93,7 +93,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
   <div>
     <p>Things cats love:</p>
     <ul>
@@ -108,7 +108,7 @@ assert(
       <li>other cats</li>
     </ol>
   </div>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md
index 117655f9e4..d9c92ddef2 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md
@@ -14,7 +14,7 @@ dashedName: turn-an-image-into-a-link
 如果我们要把图片嵌套进 `a` 元素， 可以这样写：
 
 ```html
-<a href="#"><img src="https://bit.ly/fcc-running-cats" alt="Three kittens running towards the camera."></a>
+<a href="#"><img src="https://www.bit.ly/fcc-running-cats" alt="Three kittens running towards the camera."></a>
 ```
 
 如果把 `a` 的 `href` 属性值设置为 `#`，创建的是一个死链接（不跳转到其他画面）。
@@ -58,7 +58,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
+  <img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
 
   <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
   <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
@@ -72,7 +72,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
   <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.md
index 7feb9a76c3..b13bf05edf 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.md
@@ -36,7 +36,7 @@ assert($('input').prop('required'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -50,7 +50,7 @@ assert($('input').prop('required'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL">
     <button type="submit">Submit</button>
   </form>
@@ -64,7 +64,7 @@ assert($('input').prop('required'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -78,7 +78,7 @@ assert($('input').prop('required'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <input type="text" required placeholder="cat photo URL">
     <button type="submit">Submit</button>
   </form>
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.md b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.md
index 2518f78490..008f396cfc 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.md
@@ -88,7 +88,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -102,7 +102,7 @@ assert(
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality"> Loving</label>
@@ -121,7 +121,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -135,7 +135,7 @@ assert(
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving"> Loving</label>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.md
index b71544a2d6..78f4cfe24f 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.md
@@ -64,7 +64,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -78,7 +78,7 @@ assert(
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL">
   </form>
 </main>
@@ -91,7 +91,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -105,7 +105,7 @@ assert(
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL">
     <button type="submit">Submit</button>
   </form>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.md
index 0dfdbaabf1..f949b47a35 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.md
@@ -64,7 +64,7 @@ assert($('input[type=text]').length > 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -89,7 +89,7 @@ assert($('input[type=text]').length > 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.md
index 0cc02bac79..8e6947e2eb 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.md
@@ -44,7 +44,7 @@ assert($('input[type="checkbox"]').prop('checked'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -58,7 +58,7 @@ assert($('input[type="checkbox"]').prop('checked'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving"> Loving</label>
@@ -77,7 +77,7 @@ assert($('input[type="checkbox"]').prop('checked'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -91,7 +91,7 @@ assert($('input[type="checkbox"]').prop('checked'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md
index 5e9ba729b8..cf9f0a6e40 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md
@@ -77,7 +77,7 @@ assert($('ul li').filter((_, item) => !$(item).text().trim()).length === 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
   <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
@@ -91,7 +91,7 @@ assert($('ul li').filter((_, item) => !$(item).text().trim()).length === 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <ul>
     <li>milk</li>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.md
index be99a2d2db..36fa7de48f 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.md
@@ -76,7 +76,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -90,7 +90,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <input type="text" placeholder="cat photo URL" required>
@@ -106,7 +106,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -120,7 +120,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label for="playful"><input id="playful" type="checkbox" name="personality">Playful</label>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md
index e8f5666d54..44ae710a53 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md
@@ -108,7 +108,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -122,7 +122,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL" required>
     <button type="submit">Submit</button>
   </form>
@@ -136,7 +136,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -150,7 +150,7 @@ assert($('label').parent().get(0).tagName.match('FORM'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
    <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <input type="text" placeholder="cat photo URL" required>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md
index 6f6329dd50..11d290024d 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md
@@ -42,7 +42,7 @@ assert($('input[type=text]').length > 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -68,7 +68,7 @@ assert($('input[type=text]').length > 0);
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.md
index fb87c8e225..25c3a57ad3 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.md
@@ -119,7 +119,7 @@ $('ol li').each((i, val) =>
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -139,7 +139,7 @@ $('ol li').each((i, val) =>
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.md
index abd4643ab1..8a1d5781f6 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.md
@@ -85,9 +85,9 @@ assert($('footer').eq(0).attr('id') == 'footer');
 <h2>CatPhotoApp</h2>
 <main>
 
-  <a href="https://freecatphotoapp.com" target="_blank">cat photos</a>
+  <a href="https://www.freecatphotoapp.com" target="_blank">cat photos</a>
 
-  <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
+  <img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
 
   <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
   <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
@@ -107,7 +107,7 @@ assert($('footer').eq(0).attr('id') == 'footer');
 
   <a href="#footer">Jump to Bottom</a>
 
-  <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
+  <img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
 
   <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
   <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md
index 73f4f1481d..25ab7bc137 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md
@@ -59,7 +59,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -74,7 +74,7 @@ assert(
     <li>other cats</li>
   </ol>
 
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
@@ -93,7 +93,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
   <div>
     <p>Things cats love:</p>
     <ul>
@@ -108,7 +108,7 @@ assert(
       <li>other cats</li>
     </ol>
   </div>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md
index 830d92ed6a..38436ea2db 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md
@@ -14,7 +14,7 @@ Puedes convertir elementos en enlaces, anidándolos dentro de un elemento `a`.
 Anida tu imagen dentro de un elemento `a`. A continuación, te presentamos un ejemplo:
 
 ```html
-<a href="#"><img src="https://bit.ly/fcc-running-cats" alt="Three kittens running towards the camera."></a>
+<a href="#"><img src="https://www.bit.ly/fcc-running-cats" alt="Three kittens running towards the camera."></a>
 ```
 
 Recuerda usar `#` como propiedad `href` de tu elemento `a` para convertirlo en un enlace muerto.
@@ -58,7 +58,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
+  <img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
 
   <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
   <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
@@ -72,7 +72,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
   <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.md
index 7c71bd4981..349c682940 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.md
@@ -36,7 +36,7 @@ assert($('input').prop('required'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -50,7 +50,7 @@ assert($('input').prop('required'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL">
     <button type="submit">Submit</button>
   </form>
@@ -64,7 +64,7 @@ assert($('input').prop('required'));
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -78,7 +78,7 @@ assert($('input').prop('required'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <input type="text" required placeholder="cat photo URL">
     <button type="submit">Submit</button>
   </form>
diff --git a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.md b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.md
index ebbb9d3a3a..34e0fa5c8a 100644
--- a/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.md
+++ b/curriculum/challenges/espanol/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.md
@@ -88,7 +88,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -102,7 +102,7 @@ assert(
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality"> Loving</label>
@@ -121,7 +121,7 @@ assert(
 <main>
   <p>Click here to view more <a href="#">cat photos</a>.</p>
 
-  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
+  <a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
 
   <p>Things cats love:</p>
   <ul>
@@ -135,7 +135,7 @@ assert(
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving"> Loving</label>
diff --git a/curriculum/challenges/espanol/03-front-end-libraries/bootstrap/create-a-bootstrap-row.md b/curriculum/challenges/espanol/03-front-end-libraries/bootstrap/create-a-bootstrap-row.md
index 3a5ff315bb..c8ddedb188 100644
--- a/curriculum/challenges/espanol/03-front-end-libraries/bootstrap/create-a-bootstrap-row.md
+++ b/curriculum/challenges/espanol/03-front-end-libraries/bootstrap/create-a-bootstrap-row.md
@@ -1,6 +1,6 @@
 ---
 id: bad87fee1348bd9bec908846
-title: Create a Bootstrap Row
+title: Crea una fila Bootstrap
 challengeType: 0
 forumTopicId: 16813
 dashedName: create-a-bootstrap-row
@@ -8,13 +8,13 @@ dashedName: create-a-bootstrap-row
 
 # --description--
 
-Now we'll create a Bootstrap row for our inline elements.
+Ahora crearemos una fila Bootstrap para nuestros elementos en línea.
 
-Create a `div` element below the `h3` tag, with a class of `row`.
+Crea un elemento `div` debajo de la etiqueta `h3`, con la clase `row`.
 
 # --hints--
 
-You should add a `div` element below your `h3` element.
+Debes agregar un elemento `div` debajo de tu elemento `h3`.
 
 ```js
 assert(
@@ -25,19 +25,19 @@ assert(
 );
 ```
 
-Your `div` element should have the class `row`
+Tu elemento `div` debe tener la clase `row`
 
 ```js
 assert($('div').hasClass('row'));
 ```
 
-Your `row div` should be nested inside the `container-fluid div`
+Tu `row div` debe estar anidado dentro de `container-fluid div`
 
 ```js
 assert($('div.container-fluid div.row').length > 0);
 ```
 
-Your `div` element should have a closing tag.
+Tu elemento `div` debe tener una etiqueta de cierre.
 
 ```js
 assert(
diff --git a/curriculum/challenges/espanol/03-front-end-libraries/bootstrap/make-images-mobile-responsive.md b/curriculum/challenges/espanol/03-front-end-libraries/bootstrap/make-images-mobile-responsive.md
index 54c1ec8e26..46999ad550 100644
--- a/curriculum/challenges/espanol/03-front-end-libraries/bootstrap/make-images-mobile-responsive.md
+++ b/curriculum/challenges/espanol/03-front-end-libraries/bootstrap/make-images-mobile-responsive.md
@@ -1,6 +1,6 @@
 ---
 id: bad87fee1348bd9acde08812
-title: Make Images Mobile Responsive
+title: Hacer que las imágenes se adapten a dispositivos móviles
 challengeType: 0
 forumTopicId: 18232
 dashedName: make-images-mobile-responsive
@@ -8,39 +8,39 @@ dashedName: make-images-mobile-responsive
 
 # --description--
 
-First, add a new image below the existing one. Set its `src` attribute to `https://bit.ly/fcc-running-cats`.
+Primero, agregue una nueva imagen debajo de la existente. Establezca su atributo `src` en `https://bit.ly/fcc-running-cats`.
 
-It would be great if this image could be exactly the width of our phone's screen.
+Sería genial si esta imagen pudiera tener exactamente el ancho de la pantalla de nuestro teléfono.
 
-Fortunately, with Bootstrap, all we need to do is add the `img-responsive` class to your image. Do this, and the image should perfectly fit the width of your page.
+Afortunadamente, con Bootstrap, todo lo que tenemos que hacer es agregar la clase `img-responsive` a tus imágenes. Haga esto y la imagen debe ajustarse perfectamente al ancho de su página.
 
 # --hints--
 
-You should have a total of two images.
+Debe tener un total de dos imágenes.
 
 ```js
 assert($('img').length === 2);
 ```
 
-Your new image should be below your old one and have the class `img-responsive`.
+Tu nueva imagen debería estar debajo de la anterior y tener la clase `img-responsive`.
 
 ```js
 assert($('img:eq(1)').hasClass('img-responsive'));
 ```
 
-Your new image should not have the class `smaller-image`.
+Tu nueva imagen no debería tener la clase `smaller-image`.
 
 ```js
 assert(!$('img:eq(1)').hasClass('smaller-image'));
 ```
 
-Your new image should have a `src` of `https://bit.ly/fcc-running-cats`.
+Tu nueva imagen debe tener el atributo `src` en `https://bit.ly/fcc-running-cats`.
 
 ```js
 assert($('img:eq(1)').attr('src') === 'https://bit.ly/fcc-running-cats');
 ```
 
-Your new `img` element should have a closing angle bracket.
+Tu nuevo elemento `img` debe tener una etiqueta de cierre.
 
 ```js
 assert(