How do people come up with ideas

How do people come up with ideas ?

I recently asked a person in tech who inspires me a lot how he comes up with ideas to create things.

I mean, how do you get to the point where you stop providing services; and create something useful for many (and eventually monetize it)?

I've heard a lot of answers like this: you have to find a real problem; and try to find a concrete solution to it.

But that seems really abstract to me.

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