Personally, I think it is very useful and the teachers are also very responsible. This is mainly about people, whether it's live lessons in Ling Ze, chalk, the public in China, or painting. Everyone is fine, it depends on what you are suitable for. Learn to have your own opinions, you can't rely entirely on the so-called big moves, and you don't have to worry about advertising. As for the high cost performance, I think if you choose a good teacher and stick to it, you will get high marks.