in harry potter and the philophses stone what are the rules of quidditch

When Harry has his first Quidditch practice with Wood and the rest of the Gryffindor team. Wood explains the rules to him: each team has three Chasers, one Keeper, two Beaters, and one Seeker. The Chasers score points by throwing the Quaffle through one of three rings on the opposing team’s side, while the Keeper prevents the other team from scoring in the Gryffindor rings. The Seeker’s job is to catch the Golden Snitch, a tiny winged ball that gives an additional one hundred and fifty points to whichever team catches it.