There are two primary reasons startups fail.
- They create a product no one cares about
- They don't know how to get customers
"Companies who are serious about testing quickly learn that most tests fail. Which is why growth hackers also focus on the velocity of learning – they want to fail as quickly as possible. If you assume a 90% failure rate, and one organization runs one test a week while another runs ten, it’s likely that the second organization is going to move the needle much more rapidly."
Testing new thinkgs, analyze and learn. And try again and again, that's a key of success.