Losing focus is another way that founders get off track.

You want to think about what is the path for my first 10 or 15 employees going to be as the company grows.

Ideas by themselves are not worth anything, only executing well is what creates value.

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

Most investors are obsessed with the market size today and they don't think about how the market is going to evolve.

If it takes more than a sentence to explain what you are doing, it's almost always a sign that what you are doing is too complicated.

Many of the best YC companies have had phenomenally small number of employees for their first year, sometimes none besides the founders.