In YC experience, 2 or 3 co-founders seems to be about perfect.

... how much time you should be spending on hiring? The answer is 0 or 25 percent.

... you can think about that for everyone you hire: will I bet the future of this company on this single hire? And that's a tough bar.

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

You need to figure out what the 2 or 3 most important things are, and then just do those.

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

By the way, that's my number one piece of advice if you're going to join a startup: pick a rocket ship.