Can you give me an example of a heading about football?

It means to propel the ball with the head. This is done when the ball is too high to be reached with a foot or leg. The ball is watched carefully and struck with the forehead and a skilled player can get quite a lot of control of the direction and speed. The player might also head the ball after having jumped to reach it.

A diving header is used when the ball is ahead of the player and below head height.