This guide covers the law governing the smallest businesses: those operated from a residence, from a cart, or from a truck. Part I explains the four independent layers that govern them and why satisfying one says nothing about the others. Part II covers zoning and home occupation provisions. Part III covers private restrictions in leases, deeds, and association declarations. Part IV covers cottage food law and the federal food framework. Part V covers mobile and sidewalk vending, including the constitutional dimension. Part VI covers insurance, which is the largest uncovered exposure. Part VII covers entity, licensing, and tax. Part VIII covers employees, accessibility, enforcement, and growth.