I am developing with Spring at my company, but I did not understand the structure and concept of Spring properly, and I was just writing code without thinking. Then, I listened to the instructor's lecture for the first time. I thought that this was a lecture that could help me understand Spring, such as DI, how to access DB, and AOP. Thank you for providing such a good lecture. I will listen diligently and look forward to the next lecture. Thank you.