I am taking all of Mr. Kiseon's lectures. Except for the recent lecture, I watched most of the basic lectures twice, and I have been looking up the Java series whenever I need it after reading it once. I watched this lecture again after watching the YouTube video 'How to check if you studied Spring properly in 5 minutes' and realized that I had completely forgotten about PSA! I thought I would know IoC and AOP because I watched and listened to them so often, but there were many parts that were more confusing than I thought.. When I watched it again, there were many parts that I understood much better than before, and I was able to organize what I needed to study more than before. I think I should study harder..ㅎㅎ Thank you for the great lecture even though it is free!!