A basic piano technique you want to learn early in the game and pay particular attention to as you gain more and more experience at the piano is your hand position.
The first and foremost thing you want to always remember is: relax!
Seriously, never make your hands or fingers tense. Actually, the same goes for your arms, shoulders, and the rest of you. A typical mistake beginners will make is to tighten up when approaching the piano. Please don't do that to yourself.
Okay, a great technique to use for establishing a good hand position that works well is this:
Turn your palm upwards while keeping it relaxed. Then place a ball (a baseball, rubber ball, or tennis ball) in the palm while loosely wrapping your fingers around the ball. With your other hand, you should be able to easily remove the ball and place it back again - that gives you an idea of how relaxed your fingers should be around the ball.
Next, remover the ball while maintaining your hand form as if you were still holding the ball. Then turn your hand over and rest the fleshy tips of your fingers on the keys. See how nice and curved that leaves your hand on the piano keyboard? That's good hand form.
When referring to the fingers of each hand, we generally use numbers, as follows... (applies to both hands) thumbs are 1, index fingers are 2, middle fingers are 3, ring fingers are 4, and pinkies are 5:
I can't stress it enough - relax, relax, keep it loose, relax!
Again, this is a basic piano technique you want to master very early because it's the best way to to be well prepared for all the piano playing you'll be doing in the future.
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