Last year, when I had to learn Spring in a hurry for a school project, I was looking for a Spring lecture and came across the instructor's free lecture on the roadmap. After watching the lecture all the way through, I was able to draw a rough outline of Spring and MVC in my head, so I thought, 'This is it!' and immediately bought the entire lecture. At that time, I hadn't used Java for several years, and I didn't even know anything about Java 8. I had started Spring from scratch, but he explained it so well that I could understand it even while following the roadmap. Thanks to him, I was able to achieve good results in my school project last year. If the lecture had simply taught me how to use Spring, I wouldn't have been able to listen to the whole thing. It was a great lecture that sequentially solved various requirements, showed problems that arose from them, and solved them again, so I could understand why object-oriented programming is used, what a good design is, and showed Spring using that good design, and convinced me why it should be used. That's why I was able to come this far. This lecture also started with solving requirements normally, applied all kinds of design patterns, and used Spring's empty registration design, and furthermore, everything above was a step to explain AOP, which was really amazing. I was surprised that AOP, which was briefly mentioned in the beginning lecture, whether it was a free lecture or not, was such a vast content, but I understood it after typing all the lecture contents and following it. I guess I'll have to keep doing it again to make it mine. I think it's scary that even someone like me can easily learn about Spring in such a short period of time, but I can't express how grateful I am to the instructor who spent so much time preparing this lecture. Anyway, I'll happily wait for the next lecture. And especially in this lecture, I felt that you explored design patterns really deeply, and I remember you saying that you wanted to do a lecture on design patterns later, so I'm looking forward to the distant future.