Learn how to leverage Drupal's bundle classes in this 12-minute intermediate-level talk from the Drupal Association. Discover how bundle classes define entity structure and behavior while improving code maintainability through object-oriented design principles. Explore techniques for centralizing entity-related code, reducing module coupling, and exposing functionality directly to Twig templates without preprocess layers. Master the implementation of PHP classes for entity bundles to enhance developer experience and code quality, building upon foundational knowledge of Drupal hooks, events, and Symfony concepts.