Just an opinion with insights as a bilingual. I think the FAQ or another area on SO could benefit from a clear illustrative example of what constitutes a quality question in terms of structure. I mean a newcomer who has a A1/A2 (or even B1 CEFR?) level of English won't necessarily catch on to mentions of "quality standards" or format.
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Well, it really depends on the nature of the question, and it isn't just about language to me.
A good question gives as much information as possible about the environment, hardware and other such things.
A good answer is clear and stands on his own merits.
On SU, we've fixed up answers in Russian and found that had it been in English, it would have been a pretty good answer. Bad language quality is fixable. A link only answer might be fixable. Garbage is garbage, and is quite obvious. I don't think its an English issue. It's an effort and overall quality of information problem. Giving a example of a good question or answer linguistically won't help a question with insufficient detail, or a rant in perfect English as an answer.