Stay focused and don't try to do too many things at once. Care about execution quality.

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

You have to save the vision speeches for when the company is winning. When you're not winning, you just have to get momentum back.

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.

Founders are usually very stingy with equity to employees and very generous with equity to investors. I think this is totally backwards.

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.