5% of self-help advice surprisingly wasn't bullshit I think that applies to any genre doesn't it? For example, I got into commodity options trading in the early 90's, bought almost exactly 100 books and when people asked me for book recommendation, I recommended exactly 5 books. The other 95 books were repeat info, stuff that doesn't work, or just plain bullshit. Hard skill tech books don't fall into this problem because it's so binary; it either works or it doesn't. The soft skill tech books would probably fall into this trap, if there weren't so few of them (relatively speaking).