Highly recommended First of all, the lecture is really fun ㅋㅋㅋ He keeps throwing out jokes, and it's fun to catch them. The lecture flow is to briefly explain the concept and then practice right away. This is really good because you can learn a little bit and check how it's used right away. There are a lot of build errors here and there. Rather, these are better because they give you the feeling of seeing how developers in the field handle debugging.