We have recently updated our help/on-topic page.
There is an open discussion also here: Topics and Questions I can ask about here! (Can you give us your feedback?). Anyone that has something to suggest is free to join that discussion.
As most if you should already know, SE sites are mostly run by the community and their members. Actually, the majority of the moderation needed occurs by the members. The moderators are here to generally supervise that the rules are obeyed and to provide any solutions when there is a need. But still, the good standing and health of this site, remains a responsibility of the whole community - each member new or old contributes (or at least he should) to that.
Now, that we have a definition on what On/Off-Topic questions are, it would be also useful to ensure that everyone has a good understanding on how to judge a new question, when to flag it, when to vote for closing, what reason to use to justify the close vote, and so on.
Are there any advises on how to review new questions? When to vote a question for closing, how to use the correct close reason, or when to flag a question for moderation?