The on-ball defender will jump to the ball on a pass, looking for a deflection, and get back to the ball line. Deny defenders are on the line, up the line in an open stance, with both hands up, looking straight ahead (can go for the ball with the back hand). With the ball above the foul line, weakside defenders should be on the midline (but they never get there). Don't slide, sprint. Close out to arm's length, mirror the ball, "ball up" (both hands), "ball down", one hand on the ball, step back. Force the ballhandler sideline above the foul line and to the corner below it. With ball-line defence, you're so far away that you have to leave your feet to contest shots - high jump when the shooter leaves his feet, and call "shot".
Any time the ball enters the "pro lane" (about 3-feet wider than the North American lane), it's an automatic trap by the defender closest to the ball on top (can be a high-post defender). On a post trap, the post defender takes away baseline, and zone the basket against weakside action. Ball line is "off" on a trap, the closest man takes the pass out. Mismatches don't beat you, open shots do.