There are separate tutorials (very basic) for the design software and a specific Designing for the Glowforge section in the Matrices in the Glowforge Tips and Tricks section of the forum.
You need to access them through the Table of Contents for that section, because they are Google spreadsheets.
The 2D vector Programs Matrix has commonly asked Illustrator questions, as well as Inkscape and a few for CorelDraw and Affinity Designer.
The Laser Design Basics tutorial is one that I suggest everyone read first, no matter your expertise. It explains how the Glowforge interface works and what it is looking for from a design standpoint.