Viewing all available keyboard shortcuts on a Chromebook is easy.
Press CTRL + ALT + ? to view and search al keyboard shortcuts.
Here are some of the most useful.
Copy: CTRL + C
Paste: CTRL + V
Caps Lock: SEARCH + ALT
Lock Chromebook: SEARCH + L
Logout: SHIFT + CTRL + Q (Twice)
Take screenshot: ALT + Show Windows
Take Partial Screenshot: Shift + Ctrl + Show windows
Open apps on the Shelf(Dock/Toolbar)
Hold ALT and press the corresponding number to the shelf.
If Chrome appears first it would be ALT + 1
If Camera was second it would be ALT + 2
Pin an app to the side of the screen: ALT + [ or ALT + ]