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.
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Git Logo by Jason Long is licensed under the Creative Commons Attribution 3.0 Unported License.
I haven't actually used this site (found it after I already learnt Git), but it gets posted a lot, and one issue I feel like it has is it shows you the Git graph using a tool that you have to immediately throw away after you've finished this tutorial.
I think it would be better if it had an actual real Git tool shown. I would say VSCode's Git Graph extension would be ideal but unfortunately it has a stupid 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