WordPress Foundation ★
Official WordPress learning resource with courses and tutorials
Treehouse Island Inc
Interactive coding courses for WordPress development
WordPress Foundation ★
Official WordPress documentation and code reference
WPShout
Educational WordPress content with a focus on development
Smashing Media ★
High-quality articles on web design and WordPress development
WordPress Foundation
Free video resource with recordings from WordCamps worldwide
WP101 LLC
Premium video tutorials for learning WordPress step-by-step
WPBeginner LLC ★
Free WordPress tutorials and resources for beginners
LinkWhisper
Internal linking plugin to improve SEO and user experience
Brainstorm Force
Easy schema markup plugin for better search engine visibility