Being able to write your own plugins lets you write code that you can use on all your sites, regardless of the theme. Putting your code in a plugin is usually better practice than using the theme functions file. That way, you can switch themes without losing all the custom code on your site.
In this Coffee Break Course, you'll learn how to write your first simple plugin. You'll see how to configure all the plugin metadata and how to install it on your site, and you'll also get some ideas of simple projects you can build to make your own code more reusable.
Do you want to learn WordPress development from start to finish? Check out our learning guide: Learn WordPress Development.