One thing that often disrupts momentum and really shouldn't is competitors.

More important than starting any startup, is getting to know a lot of potential co-founders.

In YC's case, the number one cause of early death for startups is cofounder blowups.

Experience matters for some roles and not others.

Before 20 or 25 employees, most companies are structured with everyone reporting to the founder. It's totally flat.

When it comes to starting startups, in many ways, it's easier to start a hard startup than an easy startup.

If you compromise and hire someone mediocre you will always regret it.