In general, it's best if you're building something that you yourself need.

I prefer to invest in a company that's going after a small but rapidly growing market than a big but slow growing one.

If it takes more than a sentence to explain what you are doing, it's almost always a sign that what you are doing is too complicated.

If it works out, you're going to be working on this for 10 years.

The startups that do well are the ones that are working all the time.

Most good founders that I know at any given time have a set of small overarching goals for the company that everybody in the company knows.

A single mediocre hire in the first five will often in fact kill a startup.