The lecture quality is really high. Since the instructor has written his own book, there are no lectures that explain concepts in a rushed manner to make progress quickly, and the lectures are really solid. Also, it is not a lecture that studies only for general Java, that is, it is not limited to the language called Java, but it feels like a Java lecture within the discipline of programming, so I think it will be a great help in my development as a developer in the future. If I had taken this lecture a little earlier, I think I would have been able to study much more easily and enjoyably.