Drupal Core APIs

Considerations When Designing Custom Drupal Entites (and Using Secondary Databases)
Data Table Implementation Patterns in Drupal
Designing Custom Entities for Secondary Databases, Bundles, and Storage Handlers in Drupal
Introducing the Node Base Field Display Manager for Drupal
JavaScript Ordering in Asset Libraries in Drupal
Static Methods in PHP
The 2026 State of Modern Drupal Frontend Development
Understanding Caching in Drupal, Pt. 1
Understanding Drupal Entity Types: Content Types vs Bundles
Writing Integration Tests (KernelTests) in Drupal