I think the lecture story for understanding AOP in depth is well-organized. I also liked that the design pattern was explained in an easy-to-understand way, not through difficult codes, but through the principles themselves. There were also a lot of practice codes, so it wasn't boring and was fun like a game. And I knew that @Transactional would make it easier, but I felt uneasy because I didn't know it properly. This lecture helped me a lot. Thank you.