I am currently listening to the basics after the free lecture after listening to the HTTP web lecture. I had to do a project with Spring in a hurry, so I first learned the login and bulletin board functions using the contents on the Internet, but I didn't understand the logic exactly. After listening to the lecture, I understood why the code was written that way. Personally, it is important to follow along, but in the case of tests, I think it is better to think about it once before knowing the answer, and in the case of non-tests, I think it is better to listen and write it myself once and listen again to follow along.