Don't let the company get distracted or excited about other things. A common mistake is that companies get excited by their own PR.

When lack of structure fails, it fails all at once. What works totally fine from 0-20 employees, is disastrous at 30.

Aim to be the best in the world at whatever you do professionally. Even if you miss, you'll probably end up in a pretty good place.

If you ever take your foot off the gas pedal, things will spiral out of control, snowball downwards.

If you're not in college and you don't know a cofounder, the next best thing I think is to go work at an interesting company.

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

Firing people is one of the worst parts of running a company. Actually in my own experience, I think it is the worst.