More importantly, hands. When you hold the ball in your hand, don't touch the ball with your palm, just touch the ball with five fingers. Then, when you shoot, you must dial out the strength of your wrist, not throw it out with the strength of your arm. Remember the key points, use your fingers and wrists to pull the ball out, not your arms and arms.
To sum up, spread your legs apart, hold the ball with your shoulders on the same body, keep your upper body straight, and when your arms are straight and close to your body, your arms are at a right angle of 90 degrees. When you shoot, your eyes will look at the highest point of the basket, and your fingers and wrists will pull the ball out. No matter two points, the posture is the same.
Going back to your second question, I personally think that the players with relatively high and stable shooting percentage in basketball are Kobe Bryant and ray allen in nba. A steady investment is a distraction.
These are the shooting postures of the two players. I hope my reply can help you. Thank you!