link for jquery code example
Example 1: ajax cdn
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
Example 2: how to add jquery to html
<!--You can insert Jquery into HTML with the <script> tag.-->
<head>
<script type = 'text/javascript' src = 'https://code.jquery.com/jquery-3.3.1.js'></script>
</head>