A good question is made up of a reasonable and simple way of asking. The question cant be too confusing or difficult so the person answering the question doesnt struggle.
These are questions that are not answerable with finality in a single lesson or a brief sentence—and that's the point. Their aim is to stimulate thought, to provoke inquiry, and to spark more questions, including thoughtful student questions, not just pat answers. They are provocative and generative.