I've recently tried to answer my own question with a bug I've had with NetBeans.
For some reason, for me at least, the question wasn't relevant since the bug stopped happening for some reason, so I did the sensible thing: wrote an answer saying it was solved. I got -3 for that answer.
It might have been better to edit my own question, but I wasn't aware of the protocol (since it was my 3rd or 2nd question). Nevertheless, that's not the issue, mainly because when you make mistakes you are most likely to learn from them rather than learning the rules on some page.
What I've seen from the comment on my answer is that it doesn't solve the case. So it kind of made me think: Are the questions on Stack Overflow more for the visitor or for the questioner?
Sure, it seems like Stack Overflow is trying to be a huge reference more than a forum.
(Not that there's anything wrong with it, on the contrary, I just want to know how to behave accordingly.)