Among all the other third-party Inflearn lectures, Younghan's lecture seems to be the best. Other lecturers assume that students know this as prerequisite knowledge or say that it is not their area to teach, but he explains these parts in detail, so it seems like a really good lecture. While listening to the lecture, I thought that he must have put a lot of effort into making the lecture. Next, I will diligently listen to the HTTP and web mvc lectures.