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Learn Git Branching
(learngitbranching.js.org)
Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
Resources
Rules
Git Logo by Jason Long is licensed under the Creative Commons Attribution 3.0 Unported License.
That, or
git log --graph --pretty=oneline
(IDK why people seem to be willing to recommend using anything in order to learn git, with the exception of git itself)
I used the textbook as the primary reference but I tried some of the games posted here and they helped me learn a nuance or two that I missed while reading the book