In anticipation for oscon 2018 this July in Portland, O’Reilly are offering a free download of Introducing GitHub (171 page PDF) by Brent Beer:
If you’re new to GitHub, this concise book shows you just what you need to get started and no more. It’s perfect for project and product managers, stakeholders, and other team members who want to collaborate on a development project—whether it’s to review and comment on work in progress or to contribute specific changes. It’s also great for developers just learning GitHub.
GitHub has rapidly become the default platform for software development, but it’s also ideal for other text-based documents, from contracts to screenplays. This hands-on book shows you how to use GitHub’s web interface to view projects and collaborate effectively with your team. The updated second edition covers code review, and includes updates to the desktop application, the Atom text editor, protected branches, and project management features.