I am a person who recently transferred from a system development position to a web service development position. When I first studied Spring, concepts such as MVC structure, domain, repository, DI, and AOP were unfamiliar and I did not understand why they were done that way. However, in this lecture, while developing and improving the example application, I was able to learn how and why these concepts are used in practice, which was good. I will also diligently listen to the next Spring and JPA lectures. Thank you, instructor. ^^