Practice, really. You learn how to do X. You adapt to ~X not being quite X, and later X not being quite ~X. You learn what Xs you care about. You learn what

Practice, really. You learn how to do X. You adapt to ~X not being quite X, and later X not being quite ~X. You learn what Xs you care about. You learn what causes ~X to not be X; afterwards ~Y makes more sense.