Drupal 8 API
Drupal 8 introduces many new APIs and includes only some of the APIs from Drupal 7/6. This section provides a detailed overview of the APIs available in Drupal 8.
Before diving into the documentation below, you might want to review the fundamentals and prerequisites as well as the Drupal 8.x module development guides, which explain some of the concepts and terminology assumed in the API documentation here.
For a crash course with meaningful depth, check out Understanding Drupal 8. It offers an overview of many key D8 APIs.
Lastly, review the Drupal 8 backward compatibility policy for an explanation of what may change between minor releases of Drupal 8 and what will remain stable.
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