I really love high-level Java lectures. However, I think that those who have never experienced native-related development before, who are non-majors and started programming with Java or Python, or who have no CS knowledge at all might find this purely introductory programming lecture a bit (?) difficult. From the beginning, the basic knowledge of various fields necessary for programming is systematically introduced, and I thought that it might crack my mentality a little. But isn't that both the advantage and disadvantage of a lecture that really finishes thoroughly? Even if the concepts introduced in the lecture don't seem directly related to the code right away, they are all things that you should know in the field and are essential concepts, so it seems good to gradually familiarize yourself with them. After taking 30% of the course, my immediate feeling was, "Ah. As expected, I can only see as much as I know." As someone who doesn't know much about compiler theory, I realized that I need to study a little more about JVM and compilers to get to the next level. Of course, it won't be right away, but it will eventually become an essential gateway to becoming an advanced developer. This lecture is a very good guideline that shows the whole forest for 'What am I lacking now? And what should I study to move forward?' After cultivating the basic ability to see the forest and the trees, I think that watching Nollonnim's (evil) vicious lectures is the pinnacle of Hwa-ryong. I will take all of the lectures and post new impressions.