Finally, I'm done!!! First of all, I liked the previous version of the lecture. I like this Security 6 version more than the previous 5 version! The more I take the lecture, the more I realize that the instructor has done a lot of analysis on the new version and created the lecture. I'll write down some features that might be helpful to others. 1. Place the filter initialization part in front of the leaf I am also really satisfied with the fact that the initialization process is placed at the very front 2. Separation of theory and practice parts The lecture is divided into each part, so it is easy to watch in about 20~30 minutes 3. Branch management for each part The branches are divided into each part, so it is very useful for taking the class 4. Teaching ability There is no need to say anything about the teaching ability, and among the security lectures or textbooks I have seen, This is a lecture that is really like light and salt Just adding a library and turning on the server, a lot of things happen... It is good because it is not a lecture that simply uses functions and ends In addition, you can develop insight into various Spring technologies What I hope for... Can you also give a new lecture on OAuth2!!!