Dunning–Kruger effect

a cog­ni­tive bias in which unskilled peo­ple make poor deci­sions and reach erro­neous con­clu­sions, but their incom­pe­tence denies them the metacog­ni­tive abil­ity to appre­ci­ate their mis­takes. The unskilled there­fore suf­fer from illu­sory supe­ri­or­ity, rat­ing their abil­ity as above aver­age, much higher than it actu­ally is, while the highly skilled under­rate their own abil­i­ties, suf­fer­ing from illu­sory inferiority.

Wikipedia

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