What is the aim of Australian rules football?

Answer 1

To outscore the opposition by scoring a higher total of points. A goal in Australian rules is worth 6 points. A goal is achieved by kicking the ball through the two tallest scoring posts. There is a set of four posts at each end of the ground. A team can score at only one set (which alternates each quarter).

Because kicking a goal is with 6 points it's very much the preferred scoring method. A behind is worth 1 point. A behind is scored by kicking the the ball into either of the taller posts, kicking the ball between a tall post (goal post) and the short post (behind post) or by having the ball carried, handballed or punch over the goal line.