Some people say “etching” instead of “engraving.”
The “First Three Prints” tutorial will take you step by step through the fundamentals: https://glowforge.com/support/topic/first-three-prints/welcome-to-the-glowforge-app-and-your-first-prints
Once you’ve gone through those, you’ll have a pretty good grounding for using the GF. For more advanced / specific questions, take a look at the “matrix,” which is linked in the first post of the Glowforge Tips and Tricks area of the forum.
Happy forging!