The explanations are neat and the code is clean, so it's easy to understand intuitively. The categorization of each lecture is also well done, so it's good to browse and listen. However, there's one fatal flaw: the code text is too small. The part where you write the code uses only a small part of the screen, and the rest of the screen is overflowing with white space. Compared to other lectures that appropriately enlarge the screen, this is a somewhat ridiculous flaw. The platform called Inflearn also provides a mobile app, but it's nearly impossible to view the lecture on a mobile phone. The shortcoming of the lecture is that it doesn't consider various screen configurations. The lecture content is very good overall, but the UX is so bad that I'm giving it two stars.