I finally finished the long and long core principles basics :)) At work, I just developed wildly with MVC, but after taking this lecture, I was able to learn a lot of codes and concepts that I had vaguely known. I think that if you take this lecture after gaining some development experience with Spring, your understanding will be much higher. ㅎㅎ What I personally regretted was that the lecture method explains method A, and then explains method B, which overcomes the shortcomings of the concept. In this process, you erase the previously written A code and move on to code B, but when reviewing, it was often confusing to catch up on the erased code. The lecture also didn't seem to be an easy lecture because it studied the basic principles of Spring and fundamental concepts that were not visually appealing, rather than displaying results on the web. However, what I finally realized after coming to the final lecture was that I was foolish for trying to easily obtain in-depth content, and that knowledge that was hard to accumulate does not evaporate easily. It was a two-month course, but it was a time well spent for a developer career that will last a lifetime. Now I will learn MVC humbly and come back to review the basic principles once more :)) Thank you so much for creating such a great course.