If you have a Glowforge laser, knowing keyboard shortcuts help speed up the process of using the cutter/engraver, and also allow you to do things there just aren't menu items for.
Glowforge recently highlighted this article (it could be new, it could be old, I am not sure - no date on it) in the interface located in the help center on Keyboard Shortcuts, which is a very handy guide.
Looking for even more? In the Glowforge Community, there was a great post last year titled Glowforge Interface Tips & Tricks for Using the App, which has a whole lot of useful information. Also, the community is a fantastic source of knowledge, help, and people. So if you haven't checked it out yet, would recommend doing so!