Be suspicious of any work that is not building product or getting customers. It's easy to get sucked into an infrastructure rewrite death spiral.

Don't let the company get distracted or excited about other things. A common mistake is that companies get excited by their own PR.

Here's a good rule of thumb: don't worry about a competitor at all, until they're actually beating you with a real shipped product.

Most investors are obsessed with the market size today and they don't think about how the market is going to evolve.

You have to be intense. This only comes from the CEO, this only comes from the founders.

You want an idea that not many other people are working on, and it's okay if it doesn't sound big at first.

Most startups are not nearly focussed enough. They work hard...maybe, but they don't work hard on the right things.