Obviously a hypothetical scenario. There is no way to pass on the knowledge to anyone else. Time freezes for you only, and once you have your answer you are out of this world.
The question can allow you to see into the past, present and future and gain comprehension of any topic/issue. But it’s only one question.
What would you want to know? Personally I’d want to see a timelapse or milestone glimpses of humanity’s future until the end of Earth’s existence (if we survive that long)
“How, subsequent to receiving this answer, can I subvert my death or cause this font of knowledge to actually be useful?”
Answer: “you can’t.” And you just wasted your question!
Well if that’s the real answer, then any question at all would be a waste.
That’s not true! Getting an answer to something doesn’t necessarily mean the thing you’re asking about is possible. You could ask me how to split myself in half and become two people, and I’d say (within my knowledge) it’s impossible. But if you ask me how computers can show a pixel on the screen, I can give you a detailed answer. Either way, I’m answering your question, just perhaps not satisfyingly.