Update README.md

Author: Alizamin Jafarli

README.md

@@ -8,9 +8,9 @@ JavaScript often abbreviated as JS, is a high-level, interpreted scripting langu
       <li>Articles:</li>
       <ul>
             <li><a href="https://www.evernote.com/shard/s386/u/0/sh/38a3284e-0dd5-43f9-850e-e00b11da8265/33c60d4efb1e7ec24b4eada875982ae0">Function expressions vs. function declarations</a></li>
+            <li><a href="https://www.evernote.com/shard/s386/u/0/sh/af2449fc-c9de-4334-9328-f5c215ea93ba/fee416e4cf8f9f6e13f8427973eedbda"> JavaScript: What the heck is a Callback? </a></li>
             <li><a href="https://www.bitdegree.org/learn/nodelist#nodelist-main-tips">NodeList vs. HTMLCollection</a> and <a href="https://www.nikpro.com.au/javascript-nodelist-and-html-dom-collection-and-how-to-use-them/">Javascript NodeList and HTML DOM collection and how to use them </a></li>
-             <li><a href="https://www.evernote.com/shard/s386/u/0/sh/af2449fc-c9de-4334-9328-f5c215ea93ba/fee416e4cf8f9f6e13f8427973eedbda"> JavaScript: What the heck is a Callback? </a></li>
-              <li><a href="https://www.evernote.com/shard/s386/u/0/sh/679872e6-9ee1-4d49-9029-b57f7749fcd5/0bdd9f06f48635a3130a5c9d07779bd1"> What is AJAX and How Does It Work? </a>, <a href="https://www.w3schools.com/whatis/whatis_ajax.asp">W3schools</a> and <a href="https://developer.mozilla.org/en-US/docs/Web/Guide/AJAX/Getting_Started">MDN</a></li>
+            <li><a href="https://www.evernote.com/shard/s386/u/0/sh/679872e6-9ee1-4d49-9029-b57f7749fcd5/0bdd9f06f48635a3130a5c9d07779bd1"> What is AJAX and How Does It Work? </a>, <a href="https://www.w3schools.com/whatis/whatis_ajax.asp">W3schools</a> and <a href="https://developer.mozilla.org/en-US/docs/Web/Guide/AJAX/Getting_Started">MDN</a></li>
       </ul>
       <li><a href="https://www.youtube.com/watch?v=y3itGTCseAk">Nodes Versus Elements in the DOM </a> (Recommend to get subscribed to his channel as well)</li>