Part of the reason for the success of WordPress is how easy it is to customize with themes and plugins. There are a huge number of plugins available in the WordPress Plugin Directory or on Envato Market, but if you want to take your WordPress skills to the next level, there's no substitute for learning to code custom plugins.

In this course, you'll learn about how plugins work and how you can create different kinds of plugin. This is a comprehensive guide to everything you need to know to write your own plugins! You'll start with the basics—how to create a new plugin, how to structure your code, and how to connect to the plugin's API. Next, you'll learn some of the fundamentals of plugin development, like including scripts and styles and sanitizing user input for basic security. Finally, you'll learn the building blocks of creating WordPress plugins: custom content types and taxonomies, adding settings to the admin page, outputting HTML content, and creating widgets and shortcodes.

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https://code.tutsplus.com/courses/introduction-to-wordpress-plugin-development