I will not promote : did books actually help u in business or not really?

does reading books really helped u with doing business? im asking because i keep seeing people say books changed everything for them, and then others say its all theory and u only learn by doing. so which one is it in real life? what im curious about specifically, - was there one book that actually changed how u run things, or just small bits here and there - did u apply it right away or did it just sit in your head - do u re reading business books or more general stuff like psychology, biographies, whatever and if books didnt do much for u, what did? mentors, just failing a lot? honest answers please, even if the answer is no they didnt help at all, and also how often do u read books? thanks!! I Will not promote