Take a time to have a look on FIFA’s Laws of the Game. It is a nice illustrated PDF, with only 16 laws, simple and clear to everyone.
Except, of course, for the most controversial law in soccer, the offside: there are at least 10 illustrations explaining when there is and when there is not offside.
And for those who still have doubts… you only score when “the whole of the ball passes over the goal line”.
mitla 