When playing the piano, technique is wildly important. The basis of a great pianist is their technique. Technique is necessary to create the best sound and to protect the pianist. Improper technique can cause injury to a pianist over time, eventually rendering them unable to play the piano all together. The best way to learn technique is by taking lessons from a professional, but hopefully these tips can help make you better.
The first lesson as a pianist is always posture. Sitting at the piano is a simple yet important issue. Always sit up straight at the piano, shoulders relaxed, knees slightly under the piano, & feet flat on the floor. Slouching can cause lower back issues over time. The piano bench does not have a back to relax on, always sit up straight. Sitting too close or too far from the piano can cause you to over extend or by constrained.
The next piece of necessary information is to always have proper technique with your hands. Carpal tunnel is a terrible degenerative disease that is partly preventable with proper technique. Always have your hands in a curved "C-Shape" with your wrists straight. Make sure that you only move your fingers and not your hand or wrist. A great way to practice this technique is to set your hands on a counter and tap; recognize that only your fingers move and not your wrist or hand. If you're using proper technique then you should feel some tendons on the outside of your arm just below your elbow moving. You want your elbows and hands to be level.
Making sure that your seat is the correct height is pertinent. Seat height contributes to both of these techniques. If your seat is too high, you'll either bend your wrists or slouch. Both of these can cause serious issues as previously outlined.
Technique often can make or break a great musician. Be sure to always pay attention to your technique. Technique is easily fixed and perfected with practice; carpal tunnel requires surgery to repair. Prevent future injury by using proper technique.