A bowling game is ten frames. A strike is worth 10 plus your next two balls, a spare 10 plus your next ball, and a perfect game is 300. A bowler’s average is total pins divided by games bowled, with the fraction dropped.
League standings are not ranked on games won but on points won and lost. A common format awards a point for each game won and another for total pins over the night (the series), so with three games there are four points on the table every week. W and L in a bowling table usually mean points, not matches.
Most leagues bowl with handicap, so bowlers of different abilities compete evenly: a bowler’s handicap is a percentage of the gap between their average and a basis score, added to every game. The bowling handicap guide works through the formula.