HEAD 🎩

I am barely “somewhat confident” in my understanding of HEAD, but Julia Evans is good at explaining computer things and she has written an excellent guide that I am looking forward to reading properly after I have completed this workshop for Booster… but you — you can study this one right now!

Julia Evans: How HEAD works in git

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And what about detached HEAD state? Julia has a comic for that:
wizardzines.com/comics/detached-head-state