Metacognitive errors
Glitches in how you think about your own thinking.
Overconfidence, the illusion of skill, the blind spot for your own blind spots. These are the errors that make you the worst judge of your own reasoning — and the reason every other glitch on this site is so hard to catch in yourself.
The other 7 types of glitch.
Systematic errors in judgment, baked into how the brain weighs evidence.
How memory rewrites itself — distortions, false confidence, fading detail.
What other people's presence, opinions, and signals do to your thinking.
Patterns that hijack a clean decision into a costly one.
Where the eyes (or attention) lie before the brain even gets a vote.
Argument moves that look like reasoning but skip a step.
Mental shortcuts — fast, often right, occasionally catastrophic.
Train against all 231 of them.
The reference is free. Buyers unlock the interactive training — Spot-the-Bias Quiz unlimited, Swipe Deck with spaced repetition, My Blindspots, Decision Pre-Flight, the Field Guide e-book, Cheat Sheets, and the Printable Deck. $29.50$59.