The Twelve-Factor App methodology defines a series of practical rules for delivering software effectively. The first important item is Codebase, in the modern application development, Git is the most popular SCM solution.
Git
Not like SVN, Git is a distributed version control system.
Github is a social coding community based on Git technology, it provides the famous Github flow and a visual web UI to for team members to collaborate effectively . Another well-known Git workflow is Git Flow.