When I first learnt VCS, I focused on history. It was only later I realised that it's wonderful for temporary notes too.
I write a lot of `// here` and `// here?` comments now, as I can easily discard them once I've committed the interesting bit.
miniblog.
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Glitch is exploring a git alternative where edits are continuously committed, then you have a slider that lets you move between historical states. Less powerful, but much more approachable!