I'm using a Chromebook and this keyboard doesn't have a "Print" button, I'm just confused as to what I would use instead of that for taking a screenshot. Thanks!
There are plenty of terminal apps that will take screenshots without the use of any keyboard function (aside from having a keyboard as input)
My personal favorite is
screenfetch as it will print out computer info as well
See also: https://github.com/KittyKatt/screenFetch
you can install it by
sudo apt-get install screenfetch scrot
The default command to take screenshot is actually
gnome-screenshot, there's several command-line flags that you can provide in addition to that, such as
gnome-screenshot -w for taking a window screenshot. Knowing this you can assign a custom keyboard shortcut via System Settings -> Keyboard -> Shortcuts. I would suggest using AltShiftP since I don't recall any other application using it, however you are free to choose among the myriad of other possible combinations.
See also: https://askubuntu.com/a/542185/295286