It's true. But what he taught you was just the basics. If you want to continue your studies, you still need to buy courses. Free teaching is just a cover to attract students. Through this, you can promote your own courses, arouse students' interest first, and then buy your own courses.

What is the self-study course for the introduction of electronic piano? 1, all parts of the hand should be naturally relaxed and not stiff. 2. The big arm (upper arm) hangs naturally, and the small arm is horizontal with the wrist and the back of the hand. 3. The fingers naturally bend slightly, and the last paragraph is perpendicular to the keyboard. 4. Touch the keys with the outside of the thumb, and touch the keys with the fingertips of other fingers. It is not advisable to touch the keys again with the strength of playing the piano by flicking the electronic organ with your fingers. Because the player plays an ordinary electronic organ, the strength of touching the keys does not affect the volume (a relatively high-grade electronic organ can also respond to the strength, except in this case). 6. It is not correct to relax your fingers excessively, even if you relax gently, because sometimes the keys are too shallow and the electronic oscillation circuit does not ring, so it is more appropriate to use the natural weight of your hands.