Summary
In this chapter, we learned about entities, value objects, and aggregates. We saw why they can be challenging to reason about and why they are probably the most important building blocks of domain-driven design.
By now, we understand the difference between value objects and entities and why value objects are much safer to use generally. Furthermore, we have learned how to use aggregates to ensure transaction boundaries, which is important in any system!
In the next chapter, Chapter 4, Factories, Repositories, and Services, we will cover the final core concepts of domain-driven design before we build some more complex applications together in Part 2!
