The Dunning–Kruger effect is a cognitive bias wherein relatively unskilled individuals suffer from illusory superiority, mistakenly assessing their ability to be much higher than is accurate. This bias is attributed to a metacognitive inability of the unskilled to accurately evaluate their own ability level. Conversely, highly skilled individuals may underestimate their relative competence, erroneously assuming that tasks that are easy for them are also easy for others.
https://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect
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