jQuery is a JavaScript framework, which purpose is to make it much easier to use JavaScript on your website.

How to execute many ajax requests and get the results in only 1 callback with jQuery $.ajax
Learn how to handle many jquery ajax responses with just 1 callback easily.
How to get the progress of an upload or download with jQuery AJAX
Learn how to retrieve the progress of an upload or a download with jQuery ajax or plain XMLHttpRequest.
How to create a jQuery plugin
Learn to create a basic jQuery plugin easily
What is the event delegation in jquery and how to use it
Learn what is the event delegation in jQuery and how to use in your projects.
Optimize your jQuery code with a couple of tips
Learn some good practices to write clean and fast jQuery code.