the.com/trial by fire

Learning to swim by drowning, then bragging about the swim lessons.

means A harsh test of ability or character that happens by being thrown straight into a difficult situation, rather than through gentle preparation.

from Rooted in medieval 'trial by ordeal,' where an accused person might have to grasp a red-hot iron or walk across burning coals — the belief being that God would protect the innocent and let the guilty burn. The physical ordeal faded, but the phrase survived, shifting from a literal test of divine judgment to a figurative one of grit and competence.

origin
medieval ordeal where guilt meant literal burning
irony
original version rarely proved innocence, mostly proved pain tolerance
modern use
now means any job with zero training budget
survivor bias
only the ones who made it tell the story
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