Not an answer
The not an answer flag can only be associated to answers themselves (and not questions). Flagging criteria differs from scenario to scenario but the end goal is almost always post removal. Keep this in mind when flagging.
Use this flag when one of the following criteria is met:
- An answer is blatantly wrong and potentially harmful or dangerous to run.
- The answer is actually a comment which needs to be moved to the appropriate post
- The answer is instead another question which needs to become it's own separate post
- Instead of editing a post, someone has posted an edit as an answer and it needs to be merged in to another post instead
If an answer is just a "poor" answer (not very detailed, little perceived value, or you feel the urge to flag as not an answer when it does not fit the above criteria) then you should down-vote that answer instead of flagging it.
While some corner cases may exist that aren't covered above, those are the majority of cases that fall under this flag.