Using the information in
Chapter 1, you can quickly get up to speed on the fundamentals of running a game of Starfinder. Using the tools in
Chapter 2, you'll be able to build precisely the option you need for any game. Using the
variant rules options in Chapter 2, you'll be able to tweak specific elements of the game, from backgrounds to the entire mathematical underpinning of the game, to suit your preferences or the needs of a particular setting or story. You'll also find advice in Chapter 2, such as guidance to make encounters more dynamic, which can help you fine-tune your GM skills. In
Chapter 3, you'll find details on the Starfinder setting.
Chapter 4 offers a variety of rules subsystems that provide a framework for specific endeavors and situations.