I am taking two Spring core lectures and JPA. I have been stuck with servlet&jsp for over 10 years, but I feel like this is not going to work out, so I am studying with a good lecture. Real-life example 4 - Inheritance relationship mapping I was trying to promote a book, but I was so surprised to see that they just wrote the book name as "JPA" out of laziness, so I am leaving a quick review. I also bought the JPA book. Haha I am listening to the lecture while reading the book, and it feels like I am reviewing, so it is good. I was impressed by Spring core. It is my first JPA lecture, and the content seems good, but the instructor's tension seems to have dropped compared to Spring core? It seems stiff? And Spring core lectures felt meticulously prepared, but the JPA lectures felt like they were improvising with existing PPT materials. That part is a bit disappointing. I wonder if you were influenced by the lecture reviews, or if most of you took the lectures late at night or until dawn. As a married man, I think it's great, but compared to the previous lectures, there are some things I'm disappointed about, so I'm leaving a disorganized review. I'm planning to listen to the next JPA lectures in order, so I'm looking forward to it. I was originally going to listen to all the lectures and then leave a review, but the JPA book promotion was so funny, lol. Good work~