You only get points when you make something the market wants. So if you work really hard on the wrong things, no one will care.

One of the biggest advantages that start ups have is execution speed and you have to have this relentless operating rhythm.

You think you have this great idea that everyone's going to come join, but that's not how it works.

If you have several ideas that all seem pretty good, work on the one that you think about, when you're not trying to think about work.

The most common post YC failure case for the companies we fund, is they're incredibly focussed during YC on their company... and after they start doing a lot of other things. They advise companies, they go to conferences, whatever.

You should always know how you're doing against your metrics. You should always have a weekly review meeting every week.

You can basically change everything in a startup but the market.