Going through LFS207 right now, meant to prepare for the LFCS. Gotta say, the material is unsatisfying, a few issues here and there, quite a bit of information that isn’t up to date and uninspired instructors (at least it seems, they make so few appearances they might as well have not recorded themselves at all) make for a really lame course, which would all be acceptable if it had been free or really low cost and by an external organisation, but no, it costs a heck ton for what it offers and it still manages to be less than insightful when it’s coming from the same foundation sponsoring Linux development, guess sponsoring is an entirely different matter from knowing or teaching (or proofreading paid material).
What it is undeniably good for, though, is letting you know that certain topics exist at all, so you can go deeper by yourself, stuff which you might not care about or come across otherwise.
Safe to say your Linux desktop experience will only translate as much as you put effort into playing around with your system, which, in a perfect world would be the least you’ll ever need, it’s definitely undesirable to make the desktop a CLI heavy experience, and in fact, I’d say that today’s Linux desktop manages to save you from the details pretty well, so you really have to go out of your way to learn sysadmin concepts and tool usage, stuff that, if you don’t need a certification, you can do just as well on your own with free articles and courses, whichever you can find