What are some of the easiest ways for a beginner to make their system untable when they start tinkering with it?
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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Moving some packages (especially libraries) onto an unstable branch while keeping others back on a stable one. It probably won't fuck you immediately, but when it does it'll be a bastard to diagnose because you will have forgotten what you did.