Here are some basic tips to become better at basketball:

1. Dribbling- One of the skills you need to master first is dribbling. First learn the correct posture for dribbling which is knees bent a little bit and bounce the ball no higher than your knees. Make sure to dribbling the ball fast and practice power dribbling.
2. Shooting- Getting the ball through the hoop is the main point of playing basketball. To improve on shooting first do shooting drills like around the world etc, practice shooting free throws, master the concept of fadeaway etc.
3. Defense- Playing good defense will not only help you get the ball back but it will also make the other player nervous while playing against you and will most likely result in a miss.
4. Teamwork- Basketball is a team sport improving on teamwork like passing the ball to the open guy or communicating with teammates letting them know whats going on around you like what player is making a cut to the basketball or what player needs to be guarded etc.