WordPress

1. Plugin Handbook

   Plugin structure, hooks, and best practices.

2. Hooks: Actions and Filters

   Actions, filters, and priority.

3. Theme Handbook

   Template hierarchy, theme structure, and the loop.

4. Block Themes and theme.json

   Block themes and global styles.

5. Block Editor Handbook

   Gutenberg blocks, block.json, and editor APIs.

6. REST API Handbook

   Routes, endpoints, authentication, and extending.

7. Custom Post Types and Taxonomies

   Registering custom content types and taxonomies.

8. Metadata and Settings API

   Post meta, options, and settings.

9. Database and wpdb

   Querying the database safely.

10. Plugin Security

    Nonces, sanitization, escaping, and capabilities.

11. HTTP API, Transients and Cron

    Scheduled tasks and caching.

12. WP-CLI

    Command line management.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

Source: endoflife.date