Book on micro-entrepreneurship. Author asks common questions that entrepreneurs should asks themselves and also give the “correct” answers. It’s really good to go through the book when validating an idea, or launching a product.
Niche markets are critical. If you want to self-fund a startup, you have to choose a niche.
Having no clear, written goals for your startup means you won’t know whether to pursue the white label deal someone offers you two weeks after launch, or to start selling in overseas markets because someone asks you to.