More keyboard shortcuts can be found by pressing Ctrl + Alt + ? or looking here
NB - School owned Chromebooks are shared devices and have been setup to reset every time a new user logs on. This means that as soon as you log off, anything that you have downloaded to the Chromebook will be deleted. If you have downloaded something and you would like to keep it, simply upload it to your Google Drive here. You can see what you have downloaded by tapping the Magnifying Glass key on the keyboard and then start typing "Files". Click on Files and look in "Downloads".