Peter Thiel, co-founder of PayPal and Palantir and the first outside investor in Facebook, distills his contrarian philosophy of technology and business into a short, dense book that challenges almost every conventional piece of startup wisdom. The central argument is captured in the title: truly valuable companies are those that create something genuinely new — going from zero to one — rather than those that incrementally improve on existing solutions by going from one to n. For Thiel, the most important business truth is that monopolies (businesses so uniquely excellent that they face no real competition) are the only businesses worth creating, and that competition destroys value rather than creating it. He argues that the Silicon Valley obsession with "disruption" — entering and improving an existing market — is fundamentally inferior to the ambition of creating new markets entirely. The book covers how to identify secrets (non-consensus truths about the world that a new business can be built around), how to build a startup team and culture, the importance of proprietary distribution channels, the distinctive characteristics of successful founders, and Thiel's controversial "definite optimism" framework for thinking about the future. The book is deliberately provocative, and many of its conclusions are contested, but its quality of thinking and its challenges to received wisdom make it one of the most intellectually stimulating books in the startup canon.