Be suspicious of any work that is not building product or getting customers.

For most of the early hires you make in a startup, experience doesn't matter very much, and you should go for aptitude.

As the company grows and about this 25 or so employee size, your main job shifts from building a great product to building a great company.

Most great companies in tech have been built by personal referrals for the first...at least 100 employees and often many more.

Remember that the idea will expand, and become more ambitious as you go.

... 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.

You should think about for the next 10 years, you're going to be giving out 3-5% of the company every year.