“Make something people want” by Paul Graham
I started with this quote because it’s the first thing you need to face when building a product. If no one wants what you are building, by definition, why build it at all? When starting, you need to obsess over knowing your users and building a product for them.
“Do things that don’t scale” by Paul Graham
One of the advantages startups have is that they can do things big companies can’t. Often, things that don’t scale are extremely effective to test things fast or get amazing customer loyalty. It doesn’t matter you can’t scale, that’s not what you need right now.