I am currently a 4th year university student. I have only taken classes at school and have not studied development separately, but I started studying Kim Young-han's Spring curriculum for the first time in February of this year. In the curriculum, after the Spring core principles lecture, it was recommended that I take this JPA Practical 1 lecture based on the wild type, but I thought that I was a 100% scholar type, so I couldn't take this lecture rashly. (Even just watching the Spring introductory lecture and following the code, It was too difficult because there was so much I didn't knowㅠㅠ) So I studied by taking the lectures according to the Spring curriculum, and after taking the Spring MVC2 lecture and getting a general idea of Spring MVC, I took this Practical 1 lecture instead of the JPA basic lecture. Fortunately, I was familiar with the existing Spring MVC and Thymeleaf content, so it wasn't a problem, and I only didn't know about the JPA-related part, but I was able to fully understand the practical lecture based on just a little bit of DB-related knowledge + the fact that JPA is a technology that links objects and tables. Of course, even if I didn't know the exact definition or operation method internally, I learned a lot just by inferring that JPA would work this way based on these annotations. And up until the existing MVC lecture, the flow was to learn about certain specific technologies intensively, but being able to continue with one project like this was refreshing, and it was a great experience. (Especially, I'm doing a graduation project this time, and through this experience, I was able to figure out the flow of where to start and in what order to develop by classifying domain, repository, service, and controller by package.) If there are any of you who are studying Spring for the first time like me and are purely scholar-type, I recommend that you study up to MVC2 according to the Spring curriculum and listen to this practical JPA1! I'm going to go back to the JPA basics lecture and look at the contents one by one. I would like to thank Kim Young-han, who continues to provide good lectures while working on other tasks, and also thank the supporters who answer my small questions. And I'm sure there were a lot of requests.. I'd like to tell you that I wish you would teach a class related to REST API😅 (And I wonder if you have any plans to write other books besides JPA, such as Spring or Java, even in the distant future. ㅎㅎ) Also, at the moment, the versions of the libraries used in this JPA1 lecture are somewhat different, so those taking the class should check them carefully. In particular, in my case, I had a hard time applying bootstrap, so it would be good if you could upgrade this part in the lecture materials in the future!