To Be Able to Use jQuery on a Web Page
You need to add a script tag in the head section, with a reference to the jQuery code version, as follows:
Introduction to jQuery
Form Validation with jQuery
jQuery selectors allow you to target particular elements on a web page.
jQuery and AJAX
AJAX is used to exchange data with a server and update a web page, without having to reload the whole page.
jQuery and AJAX from w3schools
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