I am a third-year developer who is preparing to move to Spring after working in a different field. At first, I thought about how to start studying Spring for almost a month and searched for various things, and then I came across this lecture. While listening to the lecture, I was surprised by the vastness of Spring, but I will try to follow it one by one by looking at the roadmap. I think this kind of lecture is a great help to developers who are busy digging.