Some keyboard shortcuts for menu commands used in the tutorials are platform specific. For example:
Undo: ctrl-Z on Linux/Windows, cmd-Z on Macintosh
Save: ctrl-S on Linux/Windows, cmd-S on Macintosh
In general, on Linux and Windows machines use the ctrl key to access these shortcuts for the menu commands, on a Mac use the cmd key. In the tutorials, these command keys may be mentioned as for example cmd/ctrl-S
A three-button mouse is also very convenient for using the AMS-GUI, and on a Mac you can use a Magic mouse for this purpose.