I’m trying to design a Japanese Lantern in SketchUp. I was doing some research when I came across https://www.selfcad.com/blog/what-is-hard-surface-modeling this seems to do exactly what I need but can I do that in SketchUp?
Your profile indicates you are using SketchUp Free (Web). If that’s correct, and you are thinking about the rounding of edges, you can do that manually. If you are using a desktop version (SketchUp 2021, for example) there are extensions that can do much of what is shown on that page automatically.
Do you have a tutorial example?
Not a tutorial but here is one of the extensions.