In earlier topics, we explored the Typed Data API and saw how Drupal defines structured data for fields and entities. Now we move into one of the most important layers of backend integrity: Validation Constraints.

In the previous topic, we explored the Cron API and backend automation. Now we shift focus to another important backend concept: Menu Links and Local Tasks.

In the previous topics, we explored the Queue API and the Batch API. Both allow us to process work safely and at scale. Now we move to another core backend mechanism in Drupal: the Cron API.

In the previous topic, we explored the Queue API, which allows background processing through cron. Now we move to another powerful processing system in Drupal: the Batch API.

In real Drupal applications, not every task should run immediately during a page request. Some operations are: