There's no standard per say, but generally questions should be as detailed as you can make them. This is why there are minimum character limits and such. The more detailed the question, the more likely it is that people will be interested enough to answer. One line questions tend to be seen as low effort.
The Title of your question should be a brief summary of the question:
- Why does X happen?
- If X happened, Why is Y still alive?
- What is the first instance of X in an anime?
The Body of your Question should expand on this summary, including any relevant information:
I am somewhat confused by the fight scene between A & B in episode Q at time XXm:XXs.
Character A says "I must destroy you, for you are evil", to which Character B replies "You cannot destroy me, No anime characters can defeat me".
If this is true, how did Character A destroy Character B?
As you can see, this is fairly short - but it includes all the information needed for an answerer to immediately know what you are talking about. Therefore, the only standard we impose on how you form your questions is Quality.
This might seem intimidating to someone who doesn't have English as a first language, but other users will likely edit your spelling mistakes and such if you have put enough effort into your question.
(P.S. The answer is the anime is actually a comic crossover and Character A is actually an american comic character, not an anime character [What a twist!] )