Your Chromebook comes with a track pad. Below are the gestures and actions supported by the track pad.

You can also connect your external mouse.

Source: https://sites.google.com/a/bpsk12.org/bpsedtechchromebooks/the-keyboard 

• Press Search  + Alt.

• Or press Launcher  + Alt.

• Copy selected text: Ctrl + C

• Paste text: Ctrl + V

• Cut selected text: Ctrl + X

ALT + Backspace - Delete the next letter (forward delete) 

Backspace deletes the previous character

• Search the Chromebook, Drive or Google:     (Search Key) 

• Take a screenshot: Press the Screenshot key