diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.md
index 4a9b8baa5d..d5e3e499c2 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.md
+++ b/curriculum/challenges/english/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/english/01-responsive-web-design/basic-html-and-html5/add-images-to-your-website.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-images-to-your-website.md
index 83683e4fe5..c3f4297d85 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-images-to-your-website.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-images-to-your-website.md
@@ -37,7 +37,7 @@ Let's try to add an image to our website:
 
 Within the existing `main` element, insert an `img` element before the existing `p` elements.
 
-Now set the `src` attribute so that it points to the url `https://bit.ly/fcc-relaxing-cat`
+Now set the `src` attribute so that it points to the url `https://www.bit.ly/fcc-relaxing-cat`
 
 Finally, don't forget to give your `img` element an `alt` attribute with applicable text.
 
@@ -52,7 +52,7 @@ assert($('img').length);
 Your image should have a `src` attribute that points to the kitten image.
 
 ```js
-assert(/^https:\/\/bit\.ly\/fcc-relaxing-cat$/i.test($('img').attr('src')));
+assert(/^https:\/\/www\.bit\.ly\/fcc-relaxing-cat$/i.test($('img').attr('src')));
 ```
 
 Your image element's `alt` attribute should not be empty.
@@ -86,7 +86,7 @@ assert(
 ```html
 <h2>CatPhotoApp</h2>
 <main>
-  <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>
 </main>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.md
index 81539cce21..f98753e990 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.md
+++ b/curriculum/challenges/english/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/english/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.md
index 04ff2f1f04..1e631cee5b 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.md
+++ b/curriculum/challenges/english/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($('input[type="checkbox"]').prop('checked'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md
index 23a1f7de35..82d9e09747 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.md
@@ -77,7 +77,7 @@ assert($('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/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.md
index 4b11aa5027..5486eb604a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.md
@@ -20,7 +20,7 @@ For example:
 
 # --instructions--
 
-Nest the existing `input` element inside a `form` element and assign `"https://freecatphotoapp.com/submit-cat-photo"` to the `action` attribute of the `form` element.
+Nest the existing `input` element inside a `form` element and assign `"https://www.freecatphotoapp.com/submit-cat-photo"` to the `action` attribute of the `form` element.
 
 # --hints--
 
@@ -34,11 +34,11 @@ assert(
 );
 ```
 
-Your `form` should have an `action` attribute which is set to `https://freecatphotoapp.com/submit-cat-photo`
+Your `form` should have an `action` attribute which is set to `https://www.freecatphotoapp.com/submit-cat-photo`
 
 ```js
 assert(
-  $('form').attr('action') === 'https://freecatphotoapp.com/submit-cat-photo'
+  $('form').attr('action') === 'https://www.freecatphotoapp.com/submit-cat-photo'
 );
 ```
 
@@ -61,7 +61,7 @@ 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>
@@ -86,7 +86,7 @@ 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>
@@ -100,7 +100,7 @@ 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>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.md
index 32498ada5e..689ee5b465 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.md
+++ b/curriculum/challenges/english/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($('label').parent().get(0).tagName.match('FORM'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label for="playful"><input id="playful" type="checkbox" name="personality">Playful</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md
index 89c62ddcfb..7f18d4cd69 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.md
@@ -108,7 +108,7 @@ assert($('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($('label').parent().get(0).tagName.match('FORM'));
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="https://freecatphotoapp.com/submit-cat-photo">
+  <form action="https://www.freecatphotoapp.com/submit-cat-photo">
    <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <input type="text" placeholder="cat photo URL" required>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md
index c2be68f875..e35075697a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-text-field.md
@@ -42,7 +42,7 @@ assert($('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/english/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.md
index 0eb5ab427e..3cace58712 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.md
+++ b/curriculum/challenges/english/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/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.md
index 4ae41218cb..f18bbb0d2d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.md
@@ -14,14 +14,14 @@ You can use `a` (*anchor*) elements to link to content outside of your web page.
 `a` elements need a destination web address called an `href` attribute. They also need anchor text. Here's an example:
 
 ```html
-<a href="https://freecodecamp.org">this links to freecodecamp.org</a>
+<a href="https://www.freecodecamp.org">this links to freecodecamp.org</a>
 ```
 
 Then your browser will display the text `this links to freecodecamp.org` as a link you can click. And that link will take you to the web address `https://www.freecodecamp.org`.
 
 # --instructions--
 
-Create an `a` element that links to `https://freecatphotoapp.com` and has "cat photos" as its anchor text.
+Create an `a` element that links to `https://www.freecatphotoapp.com` and has "cat photos" as its anchor text.
 
 # --hints--
 
@@ -31,10 +31,10 @@ Your `a` element should have the anchor text of `cat photos`.
 assert(/cat photos/gi.test($('a').text()));
 ```
 
-You need an `a` element that links to `https://freecatphotoapp.com`
+You need an `a` element that links to `https://www.freecatphotoapp.com`
 
 ```js
-assert(/^https?:\/\/freecatphotoapp\.com\/?$/i.test($('a').attr('href')));
+assert(/^https?:\/\/www\.freecatphotoapp\.com\/?$/i.test($('a').attr('href')));
 ```
 
 Your `a` element should have a closing tag.
@@ -56,7 +56,7 @@ assert(
 
 
 
-  <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>
@@ -69,9 +69,9 @@ assert(
 <h2>CatPhotoApp</h2>
 <main>
   
-  <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.">
   
-  <a href="https://freecatphotoapp.com">cat photos</a>
+  <a href="https://www.freecatphotoapp.com">cat photos</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>
 </main>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.md
index 37ad91a0a9..c6aa390929 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.md
+++ b/curriculum/challenges/english/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/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.md
index 51f59947b1..1858de3042 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.md
@@ -15,7 +15,7 @@ This is also handy when you're changing the behavior of a link using `JavaScript
 
 # --instructions--
 
-The current value of the `href` attribute is a link that points to "`https://freecatphotoapp.com`". Replace the `href` attribute value with a `#`, also known as a hash symbol, to create a dead link.
+The current value of the `href` attribute is a link that points to "`https://www.freecatphotoapp.com`". Replace the `href` attribute value with a `#`, also known as a hash symbol, to create a dead link.
 
 For example: `href="#"`
 
@@ -34,9 +34,9 @@ assert($('a').attr('href') === '#');
 ```html
 <h2>CatPhotoApp</h2>
 <main>
-  <p>Click here to view more <a href="https://freecatphotoapp.com" target="_blank">cat photos</a>.</p>
+  <p>Click here to view more <a href="https://www.freecatphotoapp.com" target="_blank">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>
@@ -50,7 +50,7 @@ assert($('a').attr('href') === '#');
 <main>
   <p>Click here to view more <a href="#" target="_blank">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>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.md
index ca69171bc0..1c80589fed 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.md
@@ -12,7 +12,7 @@ You can nest links within other text elements.
 
 ```html
 <p>
-  Here's a <a target="_blank" href="https://www.freecodecamp.org"> link to freecodecamp.org</a> for you to follow.
+  Here's a <a target="_blank" href="https://www.freecodecamp.org"> link to www.freecodecamp.org</a> for you to follow.
 </p>
 ```
 
@@ -34,7 +34,7 @@ Next is the *anchor* element `<a>` (which requires a closing tag `</a>`):
 <a href="https://www.freecodecamp.org" target="_blank"> ... </a>
 ```
 
-The text, `link to freecodecamp.org`, within the `a` element is called <dfn>anchor text</dfn>, and will display the link to click:
+The text, `link to www.freecodecamp.org`, within the `a` element is called <dfn>anchor text</dfn>, and will display the link to click:
 
 ```html
 <a href=" ... " target="...">link to freecodecamp.org</a>
@@ -42,7 +42,7 @@ The text, `link to freecodecamp.org`, within the `a` element is called <dfn>anch
 
 The final output of the example will look like this:  
 
-Here's a <a href="https://www.freecodecamp.org" target="_blank">link to freecodecamp.org</a> for you to follow.
+Here's a <a href="https://www.freecodecamp.org" target="_blank">link to www.freecodecamp.org</a> for you to follow.
 
 # --instructions--
 
@@ -141,7 +141,7 @@ assert(
 
   <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.</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>
@@ -155,7 +155,7 @@ assert(
 <main>
   <p>View more <a target="_blank" href="https://www.freecatphotoapp.com">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>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md
index 347d41ffeb..730b992482 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md
+++ b/curriculum/challenges/english/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/english/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md
index a02a0890f5..619ef43d1b 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.md
@@ -14,7 +14,7 @@ You can make elements into links by nesting them within an `a` element.
 Nest your image within an `a` element. Here's an example:
 
 ```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>
 ```
 
 Remember to use `#` as your `a` element's `href` property in order to turn it into a dead link.
@@ -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/english/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.md
index e77938271b..a2492bbbb4 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.md
+++ b/curriculum/challenges/english/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/english/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.md
index f97905c6e9..9137e4700a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.md
+++ b/curriculum/challenges/english/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>