Most startups don’t fail because they can’t build a product. Most startups fail because they can’t get traction.

Startup advice tends to be a lot of platitudes repackaged with new buzzwords, but Traction is something else entirely.

As Gabriel Weinberg and Justin Mares learned from their own experiences, building a successful company is hard. For every startup that grows to the point where it can go public or be profitably acquired, hundreds of others sputter and die.

Smart entrepreneurs know that the key to success isn’t the originality of your offering, the brilliance of your team, or how much money you raise. It’s how consistently you can grow and acquire new customers (or, for a free service, users). That’s called traction, and it makes everything else easier—fund-raising, hiring, press, partnerships, acquisitions. Talk is cheap, but traction is hard evidence that you’re on the right path.

Traction will teach you the nineteen channels you can use to build a customer base, and how to pick the right ones for your business.