“No one is dumb who is curious. The people who don’t ask questions are lost throughout their lives”-Neal deGrasse Tyson
The best All questions lead to more questions.
Take an object that you interact with every day and pose to yourself a new question about it. Find this difficult? Consider, then, your assumption that you know everything there is to know about your object. Your knowledge of it is infinite. Is it?
Now go back to your object and think of a question.