Biographies can be interesting, but books that extrapolate directives from case studies of winners are totally useless. If 8 of the top 10 CEOs do x, you can be sure it will be reported in that kind of book, even if 999 of the bottom 1000 failed business leaders do the same thing.

There are tons of these books, and the only lesson they teach is how often people fall for the trap of survivorship bias.