What is distinguish fact from opinion?

Distinguish fact from opinion is a concept in personal epistemology: Facts are observable events — stories are the narratives you construct around them.

Example: Your coworker left your message on read for six hours. That's the fact — a timestamp, a read receipt, silence. The story is 'she's ignoring me because she thinks my idea was stupid.' You made two moves in under a second: you observed something, then you narrated it. The observation is verifiable. The narration is invented. Until you can tell the difference in real time, your narration runs your life.

This concept is part of Phase 5 (Observation Without Judgment) in the How to Think curriculum, which builds the epistemic infrastructure for observation without judgment.