In fact, pure JPA was fun, but after learning about DataJPA, I felt, “Wow, it’s so convenient...”. I’m experiencing this once again. It’s truly the flower of JPA. I was struck by Younghan’s words that development would become so much fun if you knew about Querydsl. While listening to the previous lecture, I wondered how good Querydsl was that he recommended it so much. One thing that has changed noticeably is that my fingers are increasingly idle. While writing a query by opening parentheses and double quotation marks with em.createQuery, I used to write queries directly with @Query when they were a bit complicated and long, but now I just type s, f, w, f and IntelliJ does it all;; I think my fingers are becoming more and more lazy. This is why Younghan often talked about Querydsl in the previous lectures! ㅎㅎㅎ But at the end of the lecture, the saying, 'There is no free lunch in the world' came to mind. I felt that both DataJPA and Querydsl should be used based on an understanding of pure JPA. If you look at the internal code, it is ultimately an abstraction of pure JPA. Anything convenient has a price. I should go review the basics again to use it better ㅎㅎ JPA's father, Younghan. He is really the best! I recommend this lecture!