This section introduces three tools that are absolutely crucial for extending the functionality of WordPress's posts: custom post types, custom taxonomies, and custom fields.

Why and How to Use Custom Post Types in WordPress introduces custom post types, which let WordPress handle almost any kind of content, from portfolio items to recipes to products.
Organizing Your WordPress Data: Understanding Custom Taxonomies and Custom Fields introduces WordPress's two main systems of custom data—custom fields (also called post meta) and custom taxonomies—and explains which types of needs each one is best suited to address.
How to Create and Use WordPress Custom Taxonomies covers the core coding practices for custom taxonomies.
How to Create and Use WordPress Custom Fields covers the core coding practices for custom fields.

In this section, we're working with custom data, specifically at the post level. That means that, for the topics in this section, we want to be working in pl...