The game of hearts is scored in a golf sort of way. The lower the score the better. Usually the game is played to 100; when one player reaches one hundred, the game ends. If playing for money, payoff is based on point differential, but it has many variations.
All hearts are worth a point each, and the queen of spades is 13.
So you have one of two objectives in each hand: sluff off as many hearts and the
Queen as possible to stay low or ... if you think you have the hand, "shoot the
moon" by capturing all the hearts and the
queen. If you do, each of your opponents is "assessed" 26 points. (shooting the
moon)
It's a great play, but a risky one. A player looking to shoot the
moon often gets all but say 1 or 2 points. So instead of his opponents being
hit for 26 each, they get zero and you would
eat 24 points(if another player had, say, 2 hearts)