WordPress Block Theme Development Complete Guide 2025

Introduction

WordPress 5.0 introduced the Gutenberg block editor, and Block Themes have become the latest trend in WordPress theme development.

Block Theme vs Traditional Theme

Main Differences

• Traditional themes: use PHP template files
• Block themes: use HTML templates plus blocks
• Block themes: full-site editing, more flexible

Creating a Block Theme

Basic Files

• style.css: theme info and styles
• templates/index.html: homepage template
• parts/: reusable template parts
• functions.php: theme functions

theme.json Configuration

theme.json is the core configuration file for block themes, defining global styles, colors, fonts, block support.

Common Blocks

• query loop: dynamic content lists
• post template: article templates
• navigation: navigation menus
• site logo/title: site identity

Development Tools

• create-block theme scaffolding tool
• WordPress Playground browser testing
• Gutenberg plugin for latest blocks

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