What is the single unifying lesson tying metacognition to the debunked myths?

Feelings during study — fluency, ease, preference, familiarity — are unreliable evidence about learning, so you must judge by outcomes instead.

Every thread here is one theme. Foresight bias, the illusion of competence, and the font/volume effect show your monitoring is fooled by surface ease. Learning styles, left/right brain, and the 10% myth are comfortable stories that feel true. "It feels harder so it's worse" trusts the feeling over the result.

The antidote is the same each time: hide the answer, delay the judgment, prioritize your errors, and measure with a real test. Replace the sensation of learning with evidence of it.