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.

Control+W: to close a tab

Control+L: to highlight the URL

Control+K: creates a hyperlink

Control+2: jumps to the 2nd tab

Control+shift+T: reopens a closed tab