In general don't start a startup you're not willing to work on for ten years.

Execution gets divided into two key questions: 1) can you figure out what to do and 2) can you get it done.

... for the top twenty most valuable YC companies, all of them have at least two founders.

You're either not hiring at all or it's probably your single biggest block of time.

It's really easy to get PR with no results & it actually feels like you're really actually cool, but in a year you'll still have nothing.

One thing that founders always underestimate is how hard it is to recruit.

You should always know how you're doing against your metrics. You should always have a weekly review meeting every week.