One of the most common mistakes piano players make is to reach for the keys with the fingers. Of course, the fingers are “playing” the notes because they are in direct contact with the keys, but the fingers must be supported by the arm and hand at all times.

When practicing, ask yourself: Are you holding the arm and hand rigidly and striking the keys with the fingers?

Watch this video of Daniel Baremboim, notice the hand position. The hands are always moved over the keys by the arms, the fingers are never reaching to hit the notes:
I do learn my mistake here when learning how to play , hope beginner find this useful too .