Where can I read what kind of questions that are appropriate to ServerFault?

One could think [About](https://serverfault.com/about) page is such a place, but it is not.

1. I have a [couple of](https://serverfault.com/questions/586936/how-to-set-environment-variables) [questions](https://serverfault.com/questions/587242/should-i-use-fat-or-ntfs-when-using-windows-xp-as-a-kvm-guest) that were poorly received. I can see why the first one [How to set environment variables](https://serverfault.com/questions/586936/how-to-set-environment-variables) was downvoted (it's a basic Linux and Unix question, appropriate for that Stack Exchange site), but I can't see what wrong with a question [on FAT vs NTFS in a KVM guest](https://serverfault.com/questions/587242/should-i-use-fat-or-ntfs-when-using-windows-xp-as-a-kvm-guest). Therefore, I can't understand how my questions can be improved, so that they would be received better (which I need now, that I am autobanned). Also, it makes me very afraid to ask questions in future.

2. Anyway, what is the right thing to do when my question is poorly received (e.g. the linked two). I could delete them altogether, but then I can hardly see how I could get positive reputation: I imagine I would need to spend a lot of time learning untill I can answer any questions like the highly competent people that are getting upvotes on this site.  Asking the questions that don't suck looks like a more realistic proposition short-term.