For people saying business books are all nonsense -- why is business seen as a uniquely luck-based activity? No-one says, oh, some bridges collapse and some don't, so books about civil engineering only reflect survivorship bias. Business can't be reduced to a formula, but it can be broken down into smaller areas, each with its own principles (sales, marketing, recruiting, product development, etc). Amuroso learned these areas very quickly when she was getting started, but made some mistakes when things got bigger and the challenges increased.