The biggest start-up successes - from Henry Ford to Bill Gates to Mark Zuckerberg - were pioneered by people from solidly middle-class backgrounds. These founders were not wealthy when they began. They were hungry for success, but knew they had a solid support system to fall back on if they failed.

Most phenomenal startup teams create businesses that ultimately fail. Why? They built something that nobody wanted.

A pivot is a change in strategy without a change in vision.

If you don't know who your customer is, you don't know what quality is.

Innovation is a bottoms-up, decentralized, and unpredictable thing, but that doesn’t mean it cannot be managed.

I would say, as an entrepreneur everything you do - every action you take in product development, in marketing, every conversation you have, everything you do - is an experiment. If you can conceptualize your work not as building features, not as launching campaigns, but as running experiments, you can get radically more done with less effort.

What differentiates the success stories from the failures is that the successful entrepreneurs had the foresight, the ability, and the tools to discover which parts of their plans were working brilliantly and which were misguided, and adapt their strategies accordingly.