WordPress — resources
roadmap.sh: https://roadmap.sh/wordpress
Books
- Professional WordPress: Design and Development (Brad Williams, David Damstra, Hal Stern) — thorough guide to building and extending WordPress.
- WordPress Plugin Development Cookbook (Yannick Lefebvre) — recipe-driven coverage of the plugin and hooks APIs.
- Build Your Own Wicked WordPress Themes (SitePoint) — practical theme development from the ground up.
- Modern WordPress Development — workflow, tooling, and architecture for current WordPress projects.
Courses / practice
- WordPress Developer Resources — the official documentation for themes, plugins, and APIs.
- Learn WordPress — free official courses, workshops, and lesson plans.
- WordPress Codex — the legacy reference still useful for many core concepts.
- WordPress REST API Handbook — authoritative guide for REST API and headless work.