The most used heading technique in soccer is the standard or defensive header. Regardless of your position you will always need to use the defensive heading technique in a soccer game.
When performing a defensive header you need to arch your back, collect enough power and hit the ball with your upper forehead. A defensive header can be very effective in situations where you need to push the ball in the back of the net, pass or redirect a flying ball or as a defensive clearance.
The key to learn this heading technique is to hit the ball with your forehead just underneath the ball.