Policy on 3rd party assets on Drupal.org
Policy for including 3rd party code.
Resources
Revolt
Link
Event loop for concurrent PHP applications.
Composer
Dependency manager for PHP.
Allow AJAX links to replace a specific selector
Create links that trigger ajax calls or displays content in a modal.
Remove jQuery dependency from the once feature
Switch from jquery once to once.
Drupal Includes
/core/includes directory.
Drupal\Component\Utility
Drupal utility classes.
Services and Dependency Injection Container
Drupal services and dependency injection documentation.
Entity API
Drupal Entity API documentation.
Hooks
Drupal hooks documentation