Core Drupal Resources

• Drupal.org Documentation
• Drupal API Reference
• Drupal Core Release Notes
• Drupal Security Advisories
• Issue Queue Search (Core)
• Change Records

Frontend and Theming

• Twig Documentation
• Drupal Twig in Templates
• Theme System Overview
• Render API Overview

Module and Site Building APIs

• Form API
• Plugin API
• Entity API
• Configuration API
• Routing and Controllers

Commands

Database and Tools

• ddev import-db --src=./db.sql.gz
• ddev export-db --file=./db.sql.gz
• ddev ssh
• ddev logs -s web
• ddev xdebug on / ddev xdebug off

Composer Shortcuts for Drupal

• composer require drupal/<module_name>
• composer update drupal/core-* --with-all-dependencies
• composer why-not drupal/core <version>
• composer audit