What's the difference between piano and guitar?

You can't learn piano without nails, and you can't learn guitar without nails. If we want to reach a certain level, we must give up specializing in a key problem, not nails, but the fundamental reason lies in their different fingering: piano fingering tends to hit down, and guitar fingering tends to hook up. Practicing together is especially not conducive to strengthening fingering. You can't have it both ways! If you change the touch angle of the keys, once you get into the habit, you will be in trouble, and the strength and speed will not go up in the future, and the timbre (yes, the piano also has timbre skills) will also be affected.