Ah, right. I forgot that they’re based in Sweden. That’s understandable if it’s simply a lack of familiarity with the language, but, still, I would expect a company like Mullvad to at least have one native-equivalent English speaker to look over their public facing English stuff. None of this is the end of the world, ofc — I’m just mildly surprised.
The best way to get familiar with it is honestly to just use it. Your knowledge of the general CAD workflow will translate, but FreeCAD definitely does some things in quirky ways, and the only way to get familiar with them is to use them. The FreeCAD forum is a great place to go for help.