If you want to own a Yawei Speed Recorder, there will also be corresponding Yawei Speed Recorder tutorials on the market, and you can learn from books. In fact, it's almost like typing with a keyboard, but Yahweh is more demanding than typing with a keyboard. Sometimes he has to hit several keys with his left and right hands at the same time. If you are really interested in this aspect, you can sign up for a training class. I took this course of Yahweh in college, and I also took several courses. I think it's too difficult to persist.