At present, the most famous ones are Cai Gaoting and Liu Zhongkan. The first one is Cai Gaoting, which is very detailed, followed by Liu Zhongkan, which is also very good. In fact, videos are generally good as long as they can be systematically and continuously taught. Finally, from my own point of view, you should choose the learning style that suits you, and see which one suits you better, so you don't have to blindly follow the crowd.