Flaming is a personal attack, when you are posting something negative about a person instead of an idea about the game. There is zero need to use personal attacks in this board.

Flamebait is comments (intentional or otherwise) designed to make someone flame you. It could also be comments that are just so stupid as to tempt people to post what they really think of you. The flamebaiter will often act as the victim when this happens.

Spamming is posting the same thing, often cut and paste, repeatedly on the same or different threads. Advertising external sites or services is also considered spam.