Description
The Dunning--Kruger effect is 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. 

Actual competence may weaken self-confidence, as competent individuals may falsely assume that others have an equivalent understanding.

Followers of devondoll