Please see https://docs.gitlab.com/ee/workflow/gitlab_flow.html for the latest updated documentation
Video - https://www.youtube.com/watch?v=InKNIvky2KE&feature=youtu.be
Feature branching Short quick video - https://www.youtube.com/watch?v=j7YDbrS9I48
A little more text with command line commands - https://www.atlassian.com/git/tutorials/comparing-workflows/feature-branch-workflow