More: Terminal Basics (CLI Cheatsheet by FOSSwire)
If you get stranded in a terminal, get told to do something without any explanation how or just want to advance your skills in GNU/Linux (these are mostly GNU utilities after all), I can strongly recommend this cheatcheet made by Jacob Peddicord on FOSSwire.com. I’ve added a few things below that you might need too.
|Tabulator||Autocomplete command, directory or file name|
|Tabulator 2x||Show possible autocompletions if there are any|
|sudo||Put in front of command to execute as root.|
|apt install <package>||Install a system package or app. the tabulator hotkey comes in handy here!|
|apt search <text>||Search for package name or description containing this. Don’t use spaces!|
|apt update||Update sources of new updates (doesn’t upgrade your system)|
|apt upgrade||Install system and app updates|
|flatpak install <name>||Install a flatpak app. It works with internal names and will try to guess what you want.|
|flatpak search <name>||Search your flatpak sources for an app.|
|flatpak update||Update all your flatpak apps|
|nano <filename>||Comparably simple text editor. Use CTRL + O to save, CTRL + W to search, CTRL + C to cancel and CTRL + X to exit.|
If you need help understanding the syntax, this is an example from page 25 that breaks down the different parts of a command.