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What is in that .git directory?
(blog.meain.io)
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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I wish I had photographic memory when reading stuff like this. It's fascinating but I will never remember it.
You really really don't need photographic memory for this. I assume you read the article. Now just create a new repo and go explore the .git. Things from the article will immediately make sense. You immediately get a very intuitive understanding of tags, branches, heads, trees, commits etc. Then just give it a rest. Come back after a few days and try it again. After a while, it will be better than any photographic memory.
I wish I had a pornographic memory when reading stuff like this. Would save loads on, uh, monthly service fees.