admin-ajax.php

In case you didn’t know that, admin-ajax.php is the main file which processes all asynchronous requests (AJAX) in WordPress. So, it means that under this tag you can find all the tutorials related to WordPress AJAX.

How to Combine AJAX load more button with AJAX filters

How to use Select2 for your Meta Boxes. Creating AJAX-based Posts Dropdown with Search.

Comment Submission Without Page Refresh. No Plugins Used.

Load More Posts with AJAX. Step by Step Tutorial. No plugins.

3 Steps to Create AJAX Post Filters