In this post, Jimmy Bogard discusses the Encapsulate Collection refactoring technique, which is used to prevent access to collections in public APIs of domain models. The article covers a step-by-step process of converting an auto-property to a property with a backing field and removing the public access to the collection. This refactoring technique is useful for enforcing invariants and preventing domain models from entering an invalid state. Additionally, the article highlights the drawbacks of exposing collections and the benefits of encapsulating them. Overall, the post provides valuable insights for developers working with domain-driven design and refactoring techniques.