Imposter Syndrome gets talked about a lot right now, as something people need to overcome. I'm not sure about that. I think Imposter Syndrome (let's call it IS) may be one end of a continuum, and at the other end is Dunning-Kruger.
The Dunning-Kruger Effect (DK) is an unproven hypothesis in Psychology that people with low ability at a task overestimate their capability. While it hasn't been formally proven yet, it has the ring of deep truth to me.
The guitar riff to "Louie Louie" is a great example – it's a three chord rock song, but the third chord is supposed to be minor. More often than not, when you hear someone playing that riff, they're playing it wrong. But they don't know that. They think they're AWESOME! And if you suggest otherwise, you'll likely get some gnarly attitude back.
Seems the attitude corresponds to both the low ability and the overestimation. The DK end of the spectrum has a person telling themselves, I'm good at this, I know everything that needs to be known. Which stops them from looking any farther.
IS goes too far the other direction. Questioning everything constantly leads to analysis paralysis. In order to function in the world, we sometimes have to accept uncertainty, and trust we've done the best we can.
Zen Buddhism names the middle of the spectrum "beginner's mind". An absolute beginner doesn't make assumptions, or pretend to know anything about the subject. They approach it with openness to all its possibilities. A spirit of exploration, but also acceptance of the thing "as it is".
Maintaining beginner's mind takes effort. As time goes on, we learn about our subject – and some of those things we think we learned turn out to be incorrect. We have to constantly balance questioning and action.
Measure twice – but you gotta cut once.