My review of the lecture is, "You can understand the big architecture of Spring Security!" However, additional learning is needed to apply security to a project with just one lecture! So if you want to apply it to a project right away, this lecture may not be enough, but for someone like me who knows nothing about security, I think it will help you understand the big picture! It may not be polite to mention someone else's lecture here, but I was listening to Jang Su-won's Spring Security lecture, and the vast content was not enough, so I purchased and took the lecture. Rather than going straight into Spring Security's Filter, he started explaining the core of authentication, Authenticaiton, SecurityContext, and SecurityContextHolder, and said, This authentication process is handled by AuthenticaitonManager, and this AuthenticationManager is used by UsernamePasswordAuthenticationFilter, which handles authentication. After that, the approach of explaining FilterChainProxy, DelegatingFilterProxt, and other security filter lists one by one was very helpful in understanding the big picture of security! Now, after learning more about JWT, I'm going to try a side project. I know some of the theoretical content, but I still have the question, "How do I apply this?" Anyway, thank you for the great lecture!