some rules can not touching the ball with two hands, not touching the wall, not touching the floor on the shallow end of a pool. CAN NOT DROWN OPPOSING PLAYERS well at least not in front of the referee.
Water polo is sort of like hand ball, in the water (without touching the ground), and alot more aggressive...The first thing you need to know is that you can only ever touch the ball with one hand....
Water polo is basically a non-contact sport played in the water and is a cross between 5-a-side football and handball. The rules of water polo can be found in the related link below