Same answer as how to get to Carnegie Hall, Practice, Practice, Practice. Learn how to make a proper shot. i.e. Basketball, ensure your elbow is directly under the ball and follow through, etc But you must practice a lot to get good at it.

What the heck is up with that avatar? Ok, down to business (I can't believe you actually wanna play basketball...). Of course, practice is the key discipline. There are matters of technique and form which are important: balancing the ball on the fingertips, using the snap-of-the-wrist to provide most of the velocity (instead of "pushing" with your arms), feet shoulder width apart, etc. It's a fairly extensive list which varies with your level of strength and skill. One thing I find very helpful is to limit the variety of shots that I practice: I always practice from specific spots on the floor... those become "favorite places" to shoot from, with higher-than-average effectiveness. In a game, I'll still shoot from other spots if I'm open, but will tend to favor those spots where I practice a lot. The last bit that's very important is (....drum roll....) awareness! (big surprise!) That is, not getting caught up in thinking while shooting. The attention should be present to the experience: the feel of your body, the sensation of the ball on the fingertips, the breath going in and out, the view of the rim, etc. Getting lost in thought is bad in all sports, but when you're trying to release a 9" ball so that it will fly 20' through the air and slip gracefully into an 18" rim, concentration is critical.