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Namesort ascending Description
Information types Types of information in Drupal.
Image toolkits Functions for image file manipulations.
Hooks Define functions that alter the behavior of Drupal core.
Help and documentation Documenting modules, themes, and install profiles
Formatting Functions to format numbers, strings, dates, etc.
Form generation Describes how to generate and manipulate forms and process form submissions.
File interface Common file handling functions.
Field Widget API Define Field API widget types.
Field Types API Defines field, widget, display formatter, and storage types.
Field Formatter API Define Field API formatter types.
Field API bulk data deletion Cleans up after Field API bulk deletion operations.
Field API Attaches custom data fields to Drupal entities.
Extending and altering Drupal Overview of extensions and alteration methods for Drupal.
Events Overview of event dispatch and subscribing
Entity type characteristics Describes how to enhance entity types with additional functionality.
Entity CRUD, editing, and view hooks Hooks used in various entity operations.
Entity API Describes how to define and manipulate content and configuration entities.
Database abstraction layer Allow the use of different database servers using the same code base.
Content Moderation Workflow Type Plugin The Workflow Type plugin implemented by Content Moderation links revisionable entities to workflows.
Content markers Markers used by mark.html.twig and node_mark() to designate content.
Configuration API Information about the Configuration API.
CKEditor 5 architecture Overview The CKEditor 5 module integrates CKEditor 5 with Drupal's filtering and text editor APIs.
Callbacks Callback function signatures.
Cache API Information about the Drupal Cache API
Block API Information about the classes and interfaces that make up the Block API.
Best practices for developers Overview of standards and best practices for developers
Batch operations Creates and processes batch operations.
Automated tests Overview of PHPUnit and Nightwatch automated tests.
Annotations Annotations for class discovery and metadata description.
Annotation for translatable text Describes how to put translatable UI text into annotations.
Annotation for context definition Describes how to use ContextDefinition annotation.
Ajax API Overview for Drupal's Ajax API.

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