The Dunning-Kruger effect is a psychological idea that explains how people with low skills in a certain area often think they are much better than they actually are. At the same time, people who are truly skilled may not recognize their own expertise. This happens because those who lack knowledge do not know enough to realize what they don’t know. The effect shows that understanding a topic well helps people see their true abilities better.
source Unskilled and Unaware of It: How Difficulties in Recognizing One’s Own Incompetence Lead to Inflated Self-Assessments or return to the article of Meta-Learning