I myself used to believe ideas didn't matter that much, but I'm very sure that's wrong now.

If you have several ideas that all seem pretty good, work on the one that you think about, when you're not trying to think about work.

You certainly don't need to have everything figured out in the path from here to world domination.

In addition to relentlessly resourceful, you want a tough and a calm cofounder.

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

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

One thing I tell startups all the time is that the best way to grow is to make their product better.