Questions are powerful. Investing is an art of learning and questions are the exploratory tool you use to learn when you don't know what you don't know. Asking questions is a skill you'll have to learn, whether you're asking them of yourself in evaluating an investment opportunity or you're asking them of an entrepreneur, a broker, a researcher, or a customer.
It's important to keep questions open-ended. Just because a question is open-ended doesn't automatically make it a good one, but you can know for sure that question is falling short if the person can answer in one word.