What is the Dunning-Kruger effect, and why does it matter for critical thinking?

People with little competence in an area tend to overestimate how competent they are — precisely because the knowledge needed to judge a skill is the same knowledge needed to have it.

The cruel twist: to recognise that you're bad at something, you usually need enough expertise to see what "good" looks like — and that's exactly the expertise a beginner lacks. So the least skilled are often the most confident, whether the domain is driving, football, or judging AI output. This matters because confidence feels, from the inside, like a signal of being right. Critical thinking demands the opposite reflex: treat your own certainty as suspect, especially in areas where you know little, and seek intellectual humility as a corrective.

Tip: The antidote is the Socratic line "I know that I know nothing" — keeping a deliberate awareness of the edges of your own competence.