The guidelines on asking a good questions are known: https://english.stackexchange.com/questions/how-to-ask
The question that remains is if these should be used to up-vote and down-vote questions or should not be taken into account.
I tend to up-vote questions that I think are interesting, clear and make me research and learn something new.
Also I tend to more easily up-vote questions that someone down-voted and that I wouldn't mind seeing an answer to or can not find anything wrong with.
What is the common practice in EL&U community regarding down-voting the questions and also is up-voting if you disagree with someone's down-vote? (even though the down-vote was explained)