If you are topping the ball, don't follow your friend's advice and " keep your head down."
Keeping your head down could be contributing to the topped shot.
You must keep your knees and head at the same level and your elbows together throughout
the swing. To keep your head level you must keep your center (the upper front of your torso)
moving in the forward swing, and to keep your center moving through the hitting area and
to the finish you must let your head move with the center. Keeping your head down too
long stops the center preventing the arms to continue through the shot.
Watch David Duval and Annika Sorenstam on television and you get a perfect picture of what
the head should be doing through the hitting area.