WordPress provides a set of great tools for processing ajax requests in plugins (and themes). I’m going to give you a quick example of how these tools can be used to accomplish a variety of tasks. For this example, We’ll just be using some simple alerts, but they will serve very well for demonstration purposes.
View PostCustom Post Type Calendar Widget

The other day a user posted a question on the WordPress Stack Exchange about how to display a calendar of your site’s custom post types, much like the default WP Calendar widget. After a quick google search, I found a function written by Jennifer Dodd that did exactly this. The user who asked the question [...]
View Post calendar, custom post type, widget, widgetsHow to Create Advanced WordPress Widgets – @wproots
Creating WordPress widgets, from simple to advanced, is not a very difficult task, though it can be hard to get into developing them if you do not have the right tools. This tutorial, written at WP Roots, will give you everything you need, including an example, to begin writing advanced WordPress Widgets. This entry is [...]
View Post widget, widgetsLoad Scripts if Post has Short Code
This is a really handy trick that I just learned today. Whenever we can, it is always best to only load styles and scripts for our plugins when they are needed. This tutorial will show you how to load stylesheets and scripts only when a post contains the short code that the styles / scripts [...]
View Post Scripts. styles, short codes, shortcodesWrite a Better Related Posts Plugin for Custom Taxonomies

Related Posts Plugins are very popular as a method for WordPress users to display related content at the end of their posts, providing the reader with additional relevant content. Typically, related posts plugins use Post Tags to compare posts and find those that are related to the currently displayed post.
View Post Related posts, taxonomy, tax_query