I'm always an advocate of inswinging corners. This means left-footed players taking corners from the right side and right-footed players taking them from the left. The delivery of the cross should be bent in towards the goal, aimed at starting the ball at around the penalty spot and curling it in to someone's head in between the six-yard box and penalty spot.

This area is often called "the second six-yard box" and is where good corners should be aimed at. A good corner just needs the merest of touches from oncoming attackers to be highly effective.