I took the JPA Basics, Practice 1, 2, and SpringDataJpa lectures. Now it's time to learn QueryDsl. In fact, I have already used Spring Data JPA and Query Dsl in my practice. However, since I barely learned the basics of JPA and just learned how to use the library through Googling, I often encountered situations where I wondered why it works this way and why this error occurred. After listening to Kim Young-han's lecture from the basics, I felt that I could now create a proper JPA project. Thank you for explaining difficult content in a fun and easy way. And the explanation of JPA was helpful, but it was also helpful to give tips that would be helpful when using it in practice. However, there was one thing that was disappointing. I felt it from the latter half of Spring Data JPA, but since there was a lot of repetitive content, I felt that it was a little annoying. Haha. Well, since it's done by people, I think that can't be helped. I hope you will continue to give good lectures in the future.