Dunning-Kruger effect
As Charles Darwin wrote in The Descent of Man (1871): ‘Ignorance more frequently begets confidence than does knowledge.’
Dunning-Kruger effect
It is the tendency of people with low ability in a specific area to give overly positive assessments of this ability.
A person’s lack of knowledge and skill in a certain area causes them to overestimate their own competence. By contrast, this effect also drives those who excel in a given area to think the task is simple for everyone, leading them to underestimate their abilities.
https://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect