Before product/market fit, your only job that matters is to build a great product.

You also really want to take the time to think about how the market is going to evolve.You need a market that's going to be big in 10 years.

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

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

Keep salaries low and equity high. Keep the organization as flat as you can.

Facebook has this famous poster that says move fast and break things. But at the same time they manage to be obsessed with quality.

When lack of structure fails, it fails all at once. What works totally fine from 0-20 employees, is disastrous at 30.