Once your product is working, switch from not caring about this to caring about this a little bit.

... but actually it sucks to have a lot of employees, and you should be proud of how few employees you have.

Just put a little pin in your mind: when you cross 50 employees, there are a new set of HR rules that you have to comply with.

... the thing we see wrong with YC apps most frequently, is that people have not thought about the market first and what people want first.

Mediocre founders spend a lot of time talking about grand plans, but they never quite make a decision.

Share results (financial and key metrics) with the company every month.

Growth and momentum are what a startup lives on and you always have to focus on maintaining these.