Some questions you answer. Others you live with. These are the deep ones, the questions about reality, the self, time and right and wrong that philosophers have circled for thousands of years without ever closing the case. You won't solve them tonight. But sitting with them, slowly, is one of the oldest ways humans have made their minds bigger.
A deep question is not a problem to be solved but a door to walk through. The point isn't a tidy answer, it's the way the question stretches your thinking and loosens assumptions you didn't know you had. Take them one at a time, and give each one more patience than feels comfortable.
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There's no single one, but "Why is there something rather than nothing?" is often called the deepest, because every other question assumes an answer to it. Close behind are questions about consciousness, free will, and whether anything has objective meaning.
A deep question doesn't have a final answer you can look up, it changes how you see everything else once you take it seriously. It usually touches reality, the self, knowledge, time, or morality at their foundations.
Don't rush to resolve it. Notice your first reaction, then ask what it assumes. Try the opposite view honestly. The goal isn't to win but to understand the question more clearly, which is what philosophers mean by wisdom.
Both. Asking whether you have free will or what makes an action right quietly reshapes how you treat people, spend time, and handle regret. Abstract questions have very concrete echoes in how you live.