There are tons of em. (Click here for keyboard shortcuts or see below for some major ones you should be using):
Ctrl+N: New window
Ctrl+T: New tab
Ctrl+Shift+W: Close current window
Ctrl+Tab: Next tab
Ctrl+Shift+Right/Left Arrow: Select text one word at a time
Ctrl+Shift+Up/Down Arrow: Select text one line at a time
Alt + F or Alt + E: Opens Chrome settings menu
Alt+1, Alt+2: Navigate between different windows
Ctrl+Shift+a: Select all
Alt+Tab: Go to next window
Ctrl+F: Find
Shift+Search: Caps lock/disable caps lock
More questions? Check out Chromebook Help powered by Google
Questions about Google Apps? Check out this G Suite for Educators Doc by Kasey Bell