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If you're new to programming, read the first 3 chapters of this book and then complete this little game. Do this and you'll be better at git than--no joke--90% of programmers (especially the people in this thread, holy shit).
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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To add to that, Oh my Git is a fun little game to learn git (and the tree is visualised as well). https://ohmygit.org
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Git
Git Source Code Mirror - This is a publish-only repository but pull requests can be turned into patches to the mailing list via GitGitGadget (https://gitgitgadget.github.io/). Please follow Documentation/SubmittingPatches procedure for any of your improvements.
Unfortunately, it's not handled in git's bash autocomplete script: https://github.com/git/git/blob/master/contrib/completion/git-completion.bash. See the __git_complete_refs function. I'm not brave enough to try and add it, or push a PR for it.