Copy and Paste (and Cut)
Ctrl+C and Ctrl+V (Ctrl+X) this also works with files
Search
Ctrl+F then type what word you want to search
Switching Windows
Alt-Tab will switch the open window to the previously opened one. Holding Alt and pressing Tab multiple times will continue to cycle through open tabs. Microsoft Windows will show a box in the center of the screen, Chromebooks will just switch the open window
Open an recently closed tab
Ctrl+Shift+T will open a recently closed tab or browsing session. Good for accidentally closing out of something you didn't mean to
Restart Chromebook
Refresh+Power on a Chromebook will restart instead of powering down and powering back up