Basketball Defense Tip #1 - Defense is a state of mind, an attitude. Your desire, hustle and level of energy are as much important if not more than your skill. You should be a proactive player, not a reactive player.
Your main focus is always an urgent "get that ball back". The attitude, concentration and teamwork you bring to the game are key elements to success. The skills of defense can be taught; only you can develop the desire to win.
Basketball Defense Tip #2 - Transition play is one of the essentials of defense. You must get back to your defensive assignment quickly. Avoid letting the offense beat you down court. All too often players get lazy or waste time arguing a no-call; don’t let that happen to you. Hustle back down court and get that ball back!
Basketball Defense Tip #3 - Another essential is defending with a purpose. Mainly, prevent easy shots and get that ball back (heard that somewhere?) through steals or rebounds. Make the offense earn their points. Make them score under pressure.
Basketball Defense Tip #4 - Always apply pressure and stay low. Usually your head will be level with the ball-handler’s chest. Keep yourself positioned between the basket and the ballhandler. Wave your hands, make noises, anything to distract your opponent. You can even fake body movements such as pretending to charge the ball. The main thing is to stay low and apply pressure.
Basketball Defense Tip #5 - When guarding a player with the ball, always be ready. You should have one foot forward, the foot opposite of the ball-handler’s most dominant hand. If he is right handed, your left foot will be forward along with your left hand extended out, palm up. This will allow you to quickly flick at and steal the ball.
Usually you will keep that lead hand at whatever level the ball is; if the ball is low, so is your lead hand. If the ball is being held high, turn your palm so it facing the ball. You should also be waving your off hand so you can prevent the passing lane.
Basketball Defense Tip #6 - Position yourself between the ball-handler and the basket at all times. Cut off his path by maintaining your position between him and the basket by sliding over and staying in front of him. Don’t cross your feet.
Man-to-Man Defense - On the Ball Defense
Over-guard toward the offensive player's strong side. If your man is right-handed, over-guard that side and make him/her go left. If your opponent is on the right wing, drop your left foot back a little toward the baseline and overplay a little toward the offensive player’s right side, as this will give you time to react to a move to his/her right. Try to force offensive player to the baseline. Once at the baseline, set the trap, and do not allow any further penetration along the baseline.
Keep the palm of your lead hand facing up. Try to get at the ball from below, not by slapping down it, which results in a foul. Your other hand should be in the passing lane. Slide with your opponent, and try to get him/her to stop the dribble, and then close in and apply pressure.
Don't "reach-in". This causes you to lose your balance and defensive stance, and you become easy for the offensive player to get around. Reaching in also results in fouls and free throws for the opponent. Don't get into the bad habit of reaching-in and taking a swipe at the ball as the offensive player dribbles around you. Instead move your feet, hustle, stay with your man, and prevent him/her from getting to the basket by maintaining good on-ball defensive stance. If you get beat, sprint after the offensive player and beat him/her to a spot where you can once again resume your defensive stance.