Soccer is all about control. The team that controls the ball controls the game. Think about it. If you never let the other team have the ball, how can they score? Of course, that's completely unrealistic, but you can still try, right?
Knowing that you need to control the ball and actually getting it under control are two different things entirely. How do you get that big bouncing ball to behave? Take a look at some of the tips in this chapter and then get out and practice, practice, practice!