In short this is that relatively unskilled individuals suffer from think they know more than they do. In nice words this is “to mistakenly assessing their ability to be much higher than is accurate” as Wikipedia put it. If an unskilled person has to evaluate his own ability level accurately he tends to evaluate himself as more skilled as he should. Highly skilled individuals tend on the other side of the table to underestimate their competence assuming that easy for them indicates that it is easy for others at the same time.
Incompetent people tend to fail to observe their lack of skill, the genuine skill of others, see their limitations and to continue to not see their limitations even after exposed to more information regarding their skill. In conclusion incompetent people will not know that they are incompetent since you need skills to create an answer are the same you need to see that the answer are correct. As a result an incompetent person will not learn from feedback.
This leads us to the Imposter syndrome.
…and Dunning-Kruger effect adjusted for politics
The more we study something, the less we know. Ignorance increases faster than knowledge. Darkness moves faster than light. The less we study, the more we think we know.