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

There are 3 things I look for when I hire people. Are they smart? Do they get things done? Do I want to spend a lot of time around them?

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

What being a founder means, is signing up for this years long grind on execution - and you can't outsource this.

The thing that kills startups at some level, is the founders giving up.

The hard part is that this is a very fine line. There's right on one side of it, and crazy on the other.

... fire fast when it's not working. It's better for the company, it's also better for the employee.