It was very helpful in understanding the Spring Security architecture. However, I wish there was more time spent on practical application rather than debugging almost all filters and covering the source level in depth. For example, I wish there were more examples of how to manage user authorization information and resource access information by authorization as a database and apply them, and more examples of various applications in the latter part of the lecture. I think it would have been possible to reduce unnecessary time if the part where you create a new project every time the lecture starts was omitted.