1. There are only two things in business that you need to know - make something users love and make more then you spend.
3. Advice that will improve almost any writing: Cut half the words. Don't write anything you wouldn't say.
5. Specialists can tell you what to worry about. True experts can tell you what not to worry about.
7. The danger of being attached to a false premise is that you also discard all the connected ideas, and ideas are highly connected.
9. Technology has been eliminating jobs for centuries. But not net jobs.
"If I had to put the recipe for genius into one sentence, that might be it: to have a disinterested obsession with something that matters."
paulgraham.com/genius.html
12. In a time of bad design, building something simple is a revolutionary act.
(a) make something lots of people want, and
(b) reach and serve all those people.
Most businesses are tightly constrained in (a) or (b).
The distinctive feature of successful startups is that they're not.
If you don't know that number, you don't even know if you're doing well or badly.
15. The more elaborate the explanation of why something failed, the less likely it is to be true.
You need to be in a position where your performance is measured and you need leverage i.e. your decisions need to have a big effect.
Link to all his essays
paulgraham.com/articles.html