This book provides a broad overview of editor extensions and modifications that can be made to speed up your workflow in the Unreal Engine. It covers tips for both initial content creation as well as debugging already existing content. The book explains how several editor systems work, with a focus on how you can extend and modify them to suit your own workflow. Chapters cover how to create your own editor modes with several different kinds of tools in them, covering tools for artists and for gameplay scripting, giving you the foundation to build further tools and personalize your workflow. It also covers how to personalize toolbars and editor windows and create custom variable visualization and Blueprint nodes. Whether you are making a small indie game or an AAA game, this book will help you and your team in creating the tools needed to improve your workflow.