At the end of the Spring Boot introduction, JPA Utilization 1 was recommended first, so I started developing from the web first and completed this course. Since it was my first time with JPA, I wondered what that annotation was, join fetch? 1st cache?... I coded with a feeling of being beaten from the beginning, but after listening to this basic course, I had a fun experience where the reasons for being beaten were clearly etched into my head.ㅎㅎ I always hear people tell me to know why I'm using this code and how it works, but I reflect on myself who developed it by quickly complaining by Googling, and I'm ending this review. Thank you, instructor!~