The following text describes a cognitive bias.

The Dunning–Kruger effect is a cognitive bias in which people with low ability at a task overestimate their ability. It is related to the cognitive bias of illusory superiority and comes from the inability of people to recognize their lack of ability. Without the self-awareness of metacognition, people cannot objectively evaluate their competence or incompetence. Conversely, highly competent individuals may erroneously assume that tasks easy for them are also easy for others.