I have been going through this course at Linux Academy and as I expected, most of it so far has been old hat. However I really believe you can always learn something new from anyone. I truly believe I could learn something from someone who maybe had 6 months experience. For many reasons. For one…everyone’s workflow is different, so someone else could be doing completely different than me and maybe has researched how to do something that was important to them that I never looked into. Or maybe they’re around other Linux users at work. Anywho, everyone can learn something from someone else.
For example in this course, I learned about the file command, it’s obviously not essential because I’ve done without it for 25 years. Not long ago I learned about <CTRL>l [lowercase L] which clears the screen, I’d been typing clear for years. Also not essential but very handy and something I use a lot now.
I probably won’t go for the certification, so I don’t feel the need to memorize much of it. For example the course mentioned cat /etc/*release* a handy way to get info on your system. But that’s just something I’d probably just google if I needed it.