Suggested Google extension: Window Tiler
Ctrl+Link: Hold down the Control button
when you click on a link to open the link in
a new tab
Ctrl+F: Find - to search on whatever page
you're on - whether it's a Google Drive file
or any other website
Ctrl+Alt+M: New comment in Google Docs
Ctrl+T: Opens a new tab
Ctrl+Z: Undo - whatever you did last will be undone
Click twice to highlight a word.
Click three times to highlight a line.