Learning cli tools takes time. My advice: don’t do anything unless you are %100 sure what you are doing or you know how to revert whatever you did. When I first started using Linux I used to mess everything up by trying to solve my problems copy-pasting commands blindly. But in time I wanted to know what those commands were are, what each argument did etc. Apart from the cli tools, one can still mess things up with GUI apps if you edit system files blindly. Now this happens for people who want to dive a bit deeper. If you want a less risky swim, there are immutable distros where it’s less likely to break things.
I still keep track of what I install and what I change on my system. That helps a lot too.
She might not want to grow a beard.