This handbook is the official, community-maintained technical reference for developers who create themes for a widely-used content management system. It serves as the definitive guide for anyone building themes, from those new to theme development to experienced developers looking for authoritative standards.

Block and Classic Theme Coverage provides detailed documentation for both the modern block-based theme architecture and the traditional PHP-based classic theme system, helping developers choose and implement the right approach. Structured Learning Path offers a recommended progression through topics, starting with fundamentals and advancing to complex concepts like child themes and distribution. Community-Driven Content ensures the information is current and reflects real-world practices, as it is written and updated by active contributors to the platform's ecosystem. Practical Development Guidance includes specific instructions on theme construction, testing, user interface best practices, and preparing a theme for public release in the official directory.