People use all sorts of different software to create designs. The actual cutting is handled by the web-based Glowforge User Interface (GFUI), which also has some basic design functions:
Here are some more common “getting started” topics:
The Made on Glowforge forum category is for sharing things you create with your Glowforge and, requires a project shared in the first post of any thread. I am moving this to the Everything Else category for you.