# How Do Billion Dollar Startups Start?

**Author:** Y Combinator
**Type:** Video
**URL:** https://www.ycombinator.com/library/Li-how-do-billion-dollar-startups-start
**YouTube ID:** HB3l1BPi7zo

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The biggest companies in the world all had to start somewhere. In this episode of Office Hours, the Group Partners
explore the humble origins of several top YC companies to try and identify common traits of the most successful
founders. They’ll explore what it takes to keep your company alive in the early days, where to focus your energy and how
to find product market fit that leads you to mega success.

