 A big question is a question that needs you to answer a lot of smaller questions before you can fully grasp it. So it's a question that sends you down a bunch of rabbit holes and forces you to gain context and shift your perspective so you can see the whole picture. It's like looking at the ocean. At any given moment, you're only looking at a part of it. But understanding the parts, then when you see it from outer space, you're like, all right, I know what I'm looking at now.