We use the Gitflow workflow for our customer projects (everybody has write access to the repositories).

We use the Project Forking workflow for our open-source projects (contributors do not have write access to those repositories).

There is an abundance of workflows for git, here are some starting points:

• Atlassian Overview of Workflows

• https://docs.gitlab.com/ee/topics/gitlab_flow.html
• https://about.gitlab.com/2016/07/27/the-11-rules-of-gitlab-flow/

• http://scottchacon.com/2011/08/31/github-flow.html