Sometimes I felt that the class materials were not properly prepared, which was a bit disappointing. Thanks to the thorough lectures, I was able to grasp many of the concepts of JavaScript that I had been confused about. It might be a bit difficult for those who are just starting to study JavaScript, but it would be good for those who have heard about the concepts of JavaScript in general and have used functions or events a few times. If you listen to the lectures for 1 hour a day based on the lecture running time, you can complete the course in about 10 days, assuming that you get through the first part a little faster. Fighting everyone!