This document provides guidance on market expansion for startups. It discusses why, when, where, and how to successfully expand into new markets. The key points are: consider expanding only if it aligns with your vision and objectives, and you have the resources to support expansion without putting the home market at risk. Prioritize large, growing markets with low barriers to entry where your product fit is a good match. When expanding, test critical assumptions cheaply, localize for the new market, and hire the right local team while aligning the new market with HQ.