Post History

I think the knowledge requirement is roughly: 

- The poster should have _some_ experience working with the technology the question is about.
- The poster should have _some_ experience working computers in general. Which is probably a prerequisite to finding/using Codidact in the first place.

If the poster doesn't even have the ability to grasp any answer posted, the site won't work out well for them. Answers can't be expected to explain the most fundamental things ("First turn on your computer. The power button is usually located-..."). Similarly, I'm hesitant to providing tutorials explaining how to the most basic stuff in detail. The occasional screen shot is probably helpful though.

Encourage posters to explain what they have already tried (if applicable, ie trouble-shooting, installation etc). This gives hints of their experience and helps to narrow down the question.

Encourage posters to provide information about their experience in the question.  "I often work with X but have never used the related technology Y before" is useful information. This way we can also answer beginner questions at an appropriate level. 

But again, if the poster is someone claiming to be a complete beginner at computers and then in the next sentence asks how to create partitions on their HD or how to tweak some BIOS settings, then they aren't being sensible and the question is likely bad even though it may be on-topic. And that's what down-voting is for.