Explore best practices and advanced techniques for using Doctrine ORM effectively in PHP applications. Learn how to design entities, handle data persistence, and optimize performance in this comprehensive talk from the PHP UK Conference. Discover the advantages and disadvantages of various approaches to application design with Doctrine ORM, including entity modeling, mapping strategies, and database design considerations. Gain insights into avoiding common pitfalls, such as overuse of soft deletes and bi-directional associations, while learning to leverage features like immutable entities and custom repositories. Understand the importance of domain-driven design and how to balance normalization with practical needs. Improve your Doctrine ORM skills and create more efficient, maintainable PHP applications.