This was so common in my life and seeing this happening around me. A USA political leader and others, I needed to understand and identify. It is documented all over the internet after understanding the basic concept here.
What is the Dunning-Kruger Effect?
The Dunning-Kruger effect, effect occurs when a person’s lack of knowledge and skills in a certain area cause them to overestimate their own competence. By contrast, this effect also causes those who excel in a given area to think the task is simple for everyone, and underestimate their relative abilities as well.
What is Dunning–Kruger Effect? - Biases & Heuristics, Explained
How do I know if I suffer from Dunning-Kruger effect?
Every now and then, you may come across someone who thinks they know more about a topic than others, when they actually have little to no background to support that belief. If so, you may have encountered the Dunning-Kruger effect. It's when underperformers grossly overestimate their ability to do something
How can you avoid the Dunning–Kruger effect? Learn why it happens & how to recognize it. Find out why the Dunning–Kruger effect exists, how it affects you & how to avoid it.