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I’ll probably use my raspberry pi instead of installing a VM.

You should check out Harvard's CS50x on edx.

It's probably the best introduction to CS and programming online and teaches you the basics of the command line and C along the way.

Depending on the CS program, it's roughly equivalent of the first 1-3 semesters at a more average university, but the quality of the pedagogy is so high that it's very doable for anyone willing to put in the work.

Sure - the only benefit of a VM is that you can mess up the VM's filesystem without worrying about it too much.

Making terrible mistakes on real machines teaches you much more though (by sheer necessity if nothing else).

It might, but I'm not going to suggest that to someone trying to learn the ropes!

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