good manners

NOUN
12 LETTERS · STARTS WITH G

good manners is a valid 12-letter word worth 15 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
G2O1O1D2M3A1N1N1E1R1S1
2 + 1 + 1 + 2 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =15 PTS
DOUBLE WORD → 30TRIPLE WORD → 45
MEANING

What does good manners mean?