Whether it’s worth learning or not depends on what you’re trying to accomplish. The basics are easy enough to pick up and don’t deviate much. It’s only when you get a bit deeper in that stuff starts diverging.

As for use case: If I was strictly looking for private use, I would absolutely pick LibreOffice over the alternatives (cloud-stored data is, ah… well it’s a thing until it’s not.) I did not use it extensively when I did try it (Windows and Ubuntu) so I wasn’t quite able to get used to some of the differences. Likewise, there was far more information available for the Microsoft Office and Google Docs suites, but that is more a matter of mind share than quality of the software.

Right now I have no need for that kind of editing outside of work, and for work, I just use what’s provided. Currently that’s Google Docs and has been Microsoft Office in the past. I don’t know that I’d steer away from either of those for a decently sized business - something being industry standard means it’s something people are used to working with, after all - but for a small outfit, I’d probably go with LibreOffice still.