The key to startup success is building a product so good that people spontaneously tell their friends about it, which accounts for 80% of the work needed for success.

You don't need to scale anything until you find product-market fit, which means confirming that people actually want the product or service you've built.

To be successful in life, productize yourself by figuring out what you naturally do that the world might want and can be scaled up.

Word-of-mouth growth is the most effective form of marketing; create a compelling story about your product that users want to share.

To scale effectively, focus on creating an exceptional experience for one customer at a time before expanding to a larger audience.

The best companies grow through word of mouth, which requires that people can easily remember and understand what you do.

Doing things that don't scale allows founders to learn directly from customers, leading to better products and services.

You should not scale a company past 20 people before achieving product-market fit; once you find it, scale aggressively.

The main goal of doing things that don't scale is to maximize learning. By engaging directly with customers, you can ensure that what you're building provides real value before scaling up.