It depends heavily on region. I personally don’t think I ever had issues with parsers. I used the awesome CV template as a base. It’s fairly simple while still not being completely boring. You can find it on GitHub or overleaf iirc (it’s been a while).
Mostly yes, but they’re in general oversimplified (for obvious reasons)
But it’s more about offensive cyber security than necessarily the Linux part. The Linux part is just file system navigation and not much more, the rest is the “hacking” part, and that’s what I’m talking about
Disclaimer: I did not complete it, but I got pretty far, and I worked in the cyber security area.
I would however say it’s not a good place if you want to learn as that’s not really the game’s focus. There are better resources out there like overthewire and linuxjourney for that