It's really great that you delve into the basic principles of JPA really deeply, and at the same time, show them through practice so that you can understand them while seeing them with your own eyes! Since it's my first time, there are still some parts that I don't fully understand, but I think I'll get a better feel for it if I get some more practical experience through the utilization part. If I encounter a part that I don't understand while practicing, I'll refer to this basic part again and study in a way that I can understand it. Thank you, God Younghan!