I'm wondering if these guidelines exist.
Hi Kerrie
I would say general "how to's" type questions should be the method to use in Communities. If you have ideas and/or enhancements requests you can use the Contribute->Idea section of communities as well.
If you have a more in-depth technical question you can always start here but depending how deep it goes you may be asked to create a support ticket instead to properly manage it.
Mike