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.

Remove Posts in WordPress Dashboard with AJAX

Load More Posts with AJAX for WordPress Multisite

Order Received (Thank you) page in WooCommerce

Columns in WooCommerce

How to Change Comment Parent ID in /wp-admin/ ?

Comments Load More. With Button or Infinity Scroll. No plugins used.

Load More Posts Button + Numeric Pagination

Bulk Edit in 2 Steps

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

Mailchimp API 3.0 – PHP and AJAX subscription / unsubscription