This is the best lecture to grasp the basic concepts. Before listening to the lecture, I only knew that JPA is slow, difficult, and that complex queries should be done with SQL. When I listened to the problems of SQL-centered development in the beginning of the lecture, there were many parts that I could relate to, and I shouted Eureka! after seeing the introduction to JPA.ㅋㅋ I am a complete scholar-type, but after quickly watching Part 1 of Wild Utilization and listening to the basic lecture, I got a sense of which parts I should focus on and learn. If I had only read the book, I would have studied hard even the parts that are not used much in practice, such as Criteria Query.@.@ While listening to the lecture, I thought, "Wow, that seems like something that can't be maintained in operation," and it was fun because it matched the parts.ㅎ The explanation is easy, it's not boring in theory, and since you can check it directly with the code without complex development settings, it seems perfect for beginners!