Firstly, make sure your question is relevant to the category topic you are posted it in.

You should only ask practical, answerable questions based on something specific you want help with. 

Make sure your question is detailed and specific enough for members to be able to answer you straight away, you want to avoid members asking you to provide more detail, not only will this limit the speed in which you will receive a good answer, but it might also limit the number of helpful answers you receive.