I listened to Spring Part 2 and really enjoyed the explanation of transactions. Above all, I thought I should study the Spring Advanced Part again (self-reflection...) The fact that there were many step-by-step explanations helped me a lot in my studies. There was a time when I was looking for a good online lecture when I first started taking the nationally funded class... I first encountered the teacher's lecture 2 years ago and have been listening and studying ever since... I think I understand the big picture now... As I listen to other lectures, I review the contents of the previous lectures and study them again. The fun thing is that when I listen to them again, I understand them better... I am so grateful to the teacher who spreads knowledge through high-quality lectures.