But the aim of that is more toward CNC milling. You learn Photoshop or Gimp, like learning a CAD program, you can apply that knowledge to a wide variety of Arts and crafts. And most of the areas of interest overlap into any other design function. I can open my Canon photo's in Gimp using it's RAW plugin. That allows me to work with .RAW files before turning them into lossier jpg. PITA to find which folder it had to reside in to work properly. But even that taught me that because something which should function isn't doesn't necessarily mean it is broken.
Again more geared to CNC. We started with 3d printing and moved to CNC. So our first focus was how to translate images into 3d files. Because CAD programs use essentially the same image manipulation tools it's better to pick up the image working skills first. We are still wading through the 3d stuff. It's simple to download a file from Thingverse to print. But that takes away the fun of design. We also have a 3d camera we are trying to translate scanned images into printable files. A lot of times there are mesh incompatibilities that don't show up until the print runs. That includes downloaded files as well. Lots of trial and error.