Y Combinator is an incubator for startups but that description doesn’t quite capture it’s influence. It’s one of the world’s largest and most successful incubator in the world launching companies like Dropbox, AirBnB, and Reddit. For a while, this secret enclave was only passing out its billion dollar secrets to a select few, but then Y Combinator did something crazy. They decided to give away their secrets online for free. Prepare to unleash your inner hoodie because I’m going to give you their top 18 tips to launch your startup into the stratosphere.