Ah, I wish I could recommend some documentation outside the Ubuntu Core docs, but my learning process was pretty much Googling ad nauseam - usually ending up on

Ah, I wish I could recommend some documentation outside the Ubuntu Core docs, but my learning process was pretty much Googling ad nauseam - usually ending up on https://forum.snapcraft.io https://forum.snapcraft.io, which is rarely a good sign :( For the stuff I did, past experience with flatpak helped a bit, and there have been a few instances where I've created bind mounts to poke sandbox holes where I need them. I haven't had an excuse to play with lower level stuff like GPIO, unfortunately, but I can imagine some stable documentation would be rather useful there.