Helpful Keyboard Shortcuts
Screen Shot: Entire Screen
Press Ctrl + Show windows key.
Screen Shot: Partial Screen

Press Ctrl + Shift + Show windows key
Then select and drag over the area you want to capture.
Caps Lock on/off

Press Search key + Alt
Copy Text

After selecting the text, press Ctrl + C
Paste Text

Press Ctrl + V
To see more keyboard shortcuts
Log in to Chromebook
Open Browser
Open keyboard shortcut helper, Press Ctrl + Alt + /

*Images from Google