In this chapter, you learned everything you need to know about creating basic plugins and widgets. Now you know how to structure the plugin's PHP files, where to put your functions, and how to use hooks. You also learned about adding management pages, enabling plugins and widgets to have database access, and how to create shortcodes.
On top of all of this, you learned how to work with the REST API and perform basic communication with other WordPress websites. With your existing knowledge of PHP and HTML, you have the tools to get started writing any plugin and/or widget your heart may desire.
In the next chapter, we'll walk you through the process of creating a complete non-blog website from scratch.