It's not exactly like they they teach how to organize the perfect construction of a rocket with three million parts in school. The people who designed, built, and launched the Apollo rockets encountered matters of logistics that no one before had dealt with; as a result, they were by and large the only people who knew how to overcome them because they were the only ones who ever had to figure out how.
and so who taught them?
agreed, so why couldn't we do that again? plus we still have all their documentation from the Apollo missions, it is history, I don't think we would nave any trouble repeating it.