Ctrl+Alt+T
Open Terminal
The one that matters. Your gateway to everything.
Ctrl+Alt+F2-F6
Switch Virtual Console (TTY)
Drop to a text console. Ctrl+Alt+F1 (or F7) gets you back to the desktop.
Ctrl+C
Kill Running Command
In the terminal, stops whatever is running. A lifesaver.
Ctrl+Shift+C / Ctrl+Shift+V
Copy / Paste in Terminal
Plain Ctrl+C/V do other things in a terminal β add Shift.
Ctrl+R
Search Command History
Reverse-search past commands. Start typing to find it.
Tab
Auto-Complete
Completes file names and commands. Press twice to list options.
Super (β) Key
Activities / App Menu
Opens the overview on GNOME. The Linux "Start button".
Alt+F2
Run Command
Quick launcher to run an app by name without a terminal.
Ctrl+Alt+L
Lock Screen
Locks your session on most desktops (GNOME, KDE).