How to start writing jQuery code ?
The jQuery as we know is a javascript library, now to use this we need to include this library in our javascript or .js file.
Recall that the javascript code is written in the <script> tags and we are including the .js file of jQuery to use the jQuery functions.
<script type='text/javascript' src='jquery.js'> </script>
<!--The above line includes the jQuery file which is downloaded from jQuery.com -->
<!--Now write the script tags where you write your own jQuery code -->
<script type='text/javascript'>
//write your JS or jQuery code here
</script>
So now you know that you need to include the jQuery file first and then need to go with jQuery code.