>>105721987You learn that best by doing. Just ignore all the infodump images other anons posted, just use Linux and look it up whatever whenever you need to. The only important thing you need to know as a beginner are the commands for you package manager, since that's how you install shit. It's usually just sudo pacman -S <package> on Arch-based distros or sudo apt-get install <package>.
If you just play around/experiment/explore and try to use your Linux install (and the command line) as much as you can and browse Linux communities you'll eventually just learn all this shit naturally. It's much better to actually come into a real situation where piping a command into grep to find the information you want is the best way to do things, and learn that by doing instead of just trying to memorize all those bash utilities beforehand.