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What really sets you back is not what you don't know, it's what you think you know but really don't. Forming bad mental models and having undue confidence in them is far more dangerous than just being aware of your limitations
Maybe most of all because it takes away the drive to learn. A good intro on a topic gives you solid foundations that make you *want* to dive deeper, it doesn't make you believe you've seen everything you need to know
what you're saying is ideal but not always realistic for the large part of the world and I don't think the drive to learn more is related to who taught you first. It depends on person to person. A curious mind always finds a way to learn more and the path is not always ideal.
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