Messing around with Git. You don't need a lot of heavy wizardry, like doing an octopus merge or whatever, but the ability to do interactive rebases and cherry-pick commits is extremely useful regardless of whatever language or project you're working on.
Debugging. Again, there's a lot of depth, but as long as you can at least set a breakpoint and follow a bug through there, you should be good.
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Discussion on: Evergreen skills to use throughout your career?
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