diff --git a/2-structure/11_wiki_article.html b/2-structure/11_wiki_article.html
index 1e07a7d..dc7adf1 100644
--- a/2-structure/11_wiki_article.html
+++ b/2-structure/11_wiki_article.html
@@ -8,7 +8,7 @@
   </head>
   <body>
     <h1>Shigeru Miyamoto</h1>
-    <img width="250" src="https://upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Shigeru_Miyamoto_20150610_%28cropped%29.jpg/440px-Shigeru_Miyamoto_20150610_%28cropped%29.jpg" alt="Shigeru Miyamoto Wikipedia image" />
+    <img width="250" src="https://upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Shigeru_Miyamoto_20150610_%28cropped%29.jpg/440px-Shigeru_Miyamoto_20150610_%28cropped%29.jpg" alt="Shigeru Miyamoto Wikipedia image">
     <p><a href="https://en.wikipedia.org/wiki/Shigeru_Miyamoto" target="_blank">Shigeru Miyamoto</a> is a video game designer famous for creating notable franchises including Super Mario Bros. and The Legend of Zelda. He has worked for Nintendo since 1977.</p>
   </body>
 </html>
diff --git a/3-forms/15_google.html b/3-forms/15_google.html
index 765eaf7..75a4380 100644
--- a/3-forms/15_google.html
+++ b/3-forms/15_google.html
@@ -9,8 +9,8 @@
   <body>
     <form>
       <p>Search the web using Google!</p>
-      <input type="text" /><br>
-      <input type="submit" value="Google Search" />
+      <input type="text"><br>
+      <input type="submit" value="Google Search">
     </form>
   </body>
 </html>
diff --git a/3-forms/16_sign_up.html b/3-forms/16_sign_up.html
index d785079..af4d848 100644
--- a/3-forms/16_sign_up.html
+++ b/3-forms/16_sign_up.html
@@ -9,15 +9,15 @@
   <body>
     <form>
       <h2>Sign Up</h2>
-      Username: <input type="text" />
+      Username: <input type="text">
       <br><br>
-      Email: <input type="email" />
+      Email: <input type="email">
       <br><br>
-      Password: <input type="password" />
+      Password: <input type="password">
       <br><br>
-      Confirm Password: <input type="password" />
+      Confirm Password: <input type="password">
       <br><br>
-      <input type="submit" />
+      <input type="submit">
     </form>
   </body>
 </html>
diff --git a/3-forms/17_sign_up.html b/3-forms/17_sign_up.html
index d7a4a25..ebae1af 100644
--- a/3-forms/17_sign_up.html
+++ b/3-forms/17_sign_up.html
@@ -9,15 +9,15 @@
   <body>
     <form>
       <h2>Sign Up Page</h2>
-      Username: <input type="text" minlength="4" maxlength="10" required />
+      Username: <input type="text" minlength="4" maxlength="10" required>
       <br><br>
-      Email: <input type="email" required />
+      Email: <input type="email" required>
       <br><br>
-      Password: <input type="password" minlength="4" maxlength="10" required />
+      Password: <input type="password" minlength="4" maxlength="10" required>
       <br><br>
-      Confirm Password: <input type="password" minlength="4" maxlength="10" required />
+      Confirm Password: <input type="password" minlength="4" maxlength="10" required>
       <br><br>
-      <input type="submit" />
+      <input type="submit">
     </form>
   </body>
 </html>
diff --git a/3-forms/18_rsvp.html b/3-forms/18_rsvp.html
index 5e53398..a0e1fed 100644
--- a/3-forms/18_rsvp.html
+++ b/3-forms/18_rsvp.html
@@ -11,23 +11,23 @@
       <h2>RSVP</h2>
       <p>Come and make our special day more awesome!</p>
       <hr>
-      First Name: <input type="text" />
+      First Name: <input type="text">
       <br><br>
-      Last Name: <input type="text" />
+      Last Name: <input type="text">
       <br><br>
       Are you coming?<br>
-      Yes<input type="radio" name="invite" />
-      No<input type="radio" name="invite" />
-      Maybe<input type="radio" name="invite" />
+      Yes<input type="radio" name="invite">
+      No<input type="radio" name="invite">
+      Maybe<input type="radio" name="invite">
       <br><br>
       Any dietary restrictions for main course?<br>
-      <input type="checkbox" /> None<br>
-      <input type="checkbox" /> Vegetarian<br>
-      <input type="checkbox" /> Vegan<br>
-      <input type="checkbox" /> Gluten-free<br>
-      <input type="checkbox" /> Dairy-free
+      <input type="checkbox"> None<br>
+      <input type="checkbox"> Vegetarian<br>
+      <input type="checkbox"> Vegan<br>
+      <input type="checkbox"> Gluten-free<br>
+      <input type="checkbox"> Dairy-free
       <br><br>
-      <input type="submit" />
+      <input type="submit">
     </form>
   </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/3-forms/19_contact_us.html b/3-forms/19_contact_us.html
index fda8a83..02d64df 100644
--- a/3-forms/19_contact_us.html
+++ b/3-forms/19_contact_us.html
@@ -9,12 +9,12 @@
   <body>
     <form>
       <h2>Contact Us</h2>
-      <label for="name">Name: </label><input type="text" id="name" placeholder="Enter your name" />
+      <label for="name">Name: </label><input type="text" id="name" placeholder="Enter your name">
       <br><br>
       <label for="comment">Comment or suggestion:</label><br>
       <textarea id="comment" placeholder="Enter your comment"></textarea>
       <br><br>
-      <input type="submit" value="Submit" />
+      <input type="submit" value="Submit">
     </form>
   </body>
 </html>
diff --git a/3-forms/20_welp.html b/3-forms/20_welp.html
index 4a8b33d..7c769f7 100644
--- a/3-forms/20_welp.html
+++ b/3-forms/20_welp.html
@@ -9,22 +9,22 @@
   <body>
     <form>
       <h2>Welp! Review Form</h2>
-      <label>Reviewer Name: </label><input type="text" required />
+      <label>Reviewer Name: </label><input type="text" required>
       <br><br>
-      <label>What are you reviewing? </label><input type="text" required />
+      <label>What are you reviewing? </label><input type="text" required>
       <br><br>
       <label>Would you try again?</label>
       <br>
-      <input type="radio" name="try-again" /> No
-      <input type="radio" name="try-again" /> Not Sure
-      <input type="radio" name="try-again" /> Yes
+      <input type="radio" name="try-again"> No
+      <input type="radio" name="try-again"> Not Sure
+      <input type="radio" name="try-again"> Yes
       <br><br>
-      <label>Overall Rating (out of 5): </label><input type="number" min="0" max="5" required/>
+      <label>Overall Rating (out of 5): </label><input type="number" min="0" max="5" required>
       <br><br>
       <label>My Review</label><br>
       <textarea maxlength="250"></textarea>
       <br><br>
-      <input type="submit" value="Submit Review"/>
+      <input type="submit" value="Submit Review">
     </form>
   </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/4-semantic-html/23_main_footer.html b/4-semantic-html/23_main_footer.html
index fcfbd55..0ae7101 100644
--- a/4-semantic-html/23_main_footer.html
+++ b/4-semantic-html/23_main_footer.html
@@ -18,7 +18,7 @@ <h1>My Blog</h1>
       </nav>
     </header>
     <!-- From Exercise 23 -->
-    <br/>
+    <br>
     <main>
       <h2>My Personal Blog</h2>
     </main>
diff --git a/4-semantic-html/24_blog_posts.html b/4-semantic-html/24_blog_posts.html
index 28ac7d5..62d264f 100644
--- a/4-semantic-html/24_blog_posts.html
+++ b/4-semantic-html/24_blog_posts.html
@@ -17,7 +17,7 @@ <h1>My Blog</h1>
         </ul>
       </nav>
     </header>
-    <br/>
+    <br>
     <main>
       <!-- From Exercise 24 -->
       <section id="about-section">
@@ -26,20 +26,20 @@ <h2>About Me</h2>
           <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
         </article>
       </section>
-      <br/>
+      <br>
       <section id="stories-section">
         <h2>Stories</h2>
         <article>
-          <br/>
+          <br>
           <h3>Title</h3>
           <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
         </article>
-        <br/><hr/><br/>
+        <br><hr><br>
         <article>
           <h3>Title</h3>
           <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
         </article>
-        <br/><hr/><br/>
+        <br><hr><br>
         <article>
           <br>
           <h3>Title</h3>
diff --git a/4-semantic-html/25_figures.html b/4-semantic-html/25_figures.html
index ff13679..930e0aa 100644
--- a/4-semantic-html/25_figures.html
+++ b/4-semantic-html/25_figures.html
@@ -17,40 +17,40 @@ <h1>My Blog</h1>
         </ul>
       </nav>
     </header>
-    <br/>
+    <br>
     <main>
       <section id="about-section">
         <h2>About Me</h2>
         <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
       </section>
-      <br/>
+      <br>
       <section id="stories-section">
         <h2>Stories</h2>
         <article>
           <!-- From Exercise 25 -->
           <figure>
-            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian" />
+            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian">
             <figcaption>A piece of obsidian</figcaption>
           </figure>
-          <br/>
+          <br>
           <h3>Title</h3>
           <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
         </article>
-        <br/><hr/><br/>
+        <br><hr><br>
         <article>
           <!-- From Exercise 25 -->
           <figure>
-            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian" />
+            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian">
             <figcaption>A piece of obsidian</figcaption>
           </figure>
           <h3>Title</h3>
           <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
         </article>
-        <br/><hr/><br/>
+        <br><hr><br>
         <article>
           <!-- From Exercise 25 -->
           <figure>
-            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian" />
+            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian">
             <figcaption>A piece of obsidian</figcaption>
           </figure>
           <br>
diff --git a/4-semantic-html/26_final_touches.html b/4-semantic-html/26_final_touches.html
index 9055b93..d88dbec 100644
--- a/4-semantic-html/26_final_touches.html
+++ b/4-semantic-html/26_final_touches.html
@@ -33,37 +33,37 @@ <h1>My Blog</h1>
         </ul>
       </nav>
     </header>
-    <br/>
+    <br>
     <main>
       <section id="about-section">
         <h2>About Me</h2>
         <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
       </section>
-      <br/>
+      <br>
       <section id="stories-section">
         <h2>Stories</h2>
         <article>
           <figure>
-            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian" />
+            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian">
             <figcaption>A piece of obsidian</figcaption>
           </figure>
-          <br/>
+          <br>
           <h3>Title</h3>
           <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
         </article>
-        <br/><hr/><br/>
+        <br><hr><br>
         <article>
           <figure>
-            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian" />
+            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian">
             <figcaption>A piece of obsidian</figcaption>
           </figure>
           <h3>Title</h3>
           <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
         </article>
-        <br/><hr/><br/>
+        <br><hr><br>
         <article>
           <figure>
-            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian" />
+            <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian">
             <figcaption>A piece of obsidian</figcaption>
           </figure>
           <br>
