You could make a list of dozens of items; let's keep it brief.
Commit to academic excellence. "No ability without eligibility."
Read at least an hour a day. Learning isn't optional for achievement.
Learn the game. Study!
Get in great condition. Basketball isn't a running game, it's a sprinting game.
Footwork, balance, maneuvering speed. Buy a jumprope. Use it.
Learn fundamentals first. Technique trumps tactics.
Shoot, shoot, shoot. Repetitions build reputations.
Share. The best players make everyone around them better.
Be a "Positive Dog" Attitude comes first.
Control what you can control. Attitude, choices, effort.