First Step: Git

https://confluence.atlassian.com/bitbucketserver/basic-git-commands-776639767.html
https://www.atlassian.com/agile/software-development/git
https://www.atlassian.com/agile/software-development/git-branching-video
https://git-scm.com/docs

https://git-scm.com/docs/git-stash
https://git-scm.com/book/en/v2/Git-Tools-Submodules

https://www.gerritcodereview.com/index.html

https://stackoverflow.com/questions/4089430/how-can-i-determine-the-url-that-a-local-git-repository-was-originally-cloned-fr

Common Commands
git status
git log
git log --oneline
git hist
git diff HEAD

Git with Netbeans IDE
https://netbeans.org/kb/docs/ide/git.html