You can learn the general flow of the web backend using Spring. To help those who are listening to the lecture, I think this lecture is a lecture that covers the big picture, but as you watch, there will come a moment where you think, "So what is this? What is that term?" At that time, I recommend that you just focus on why you are "experiencing" this and make a note of it and think, "Oh, this is how it is used in real life. I'll look into it later."