In golf, scores less than 120 strokes are seen as respectable, or "good" scores among amateur golfers. While 90 stroke scores are considered average, scores below 120 strokes on an 18-hole course are seen amongst the golf community as relatively good.
Professional golfers are a clear outlier in this discussion. Typically, the pros perform somewhere below this 90 stroke average and often have games below the 72 stroke par of a course. To them, a good score may not be under 120, but under 72 instead.
An average golfer will play a round of golf and attempt to score the lowest point value possible. Points are thought of in terms of the number of strokes, or swings of a golf club in any given round. Over the course of 18 holes, an average amateur golfer will achieve a score of 90 strokes on a 72 par course. Par refers to the number of strokes needed in order to not gain or lose any points on a particular hole. Thus, if the par of a hole is four strokes and a player who has a current score of 20 lands the ball into the hole in four strokes, their score at the end of that particular hole will be 24.