The title of the post is 'Know where the lines are". Bit obvious really - they are on the sides of the court. Unfortunately too many players are happy to play it safe and just push the ball down the middle. So next time you practice see if you can put the ball nearer the side line and/or baseline. Don't aim at the lines - aim inside the lines. This will give you a margin for error. How far you aim inside the lines will depend on your ability. Try it. Now watch your opponent move.....