I had a friend who was about as computer illiterate as they come, they had a crappy gateway laptop(netbook maybe) that had kubuntu on it they preferred it to when they had win vista(yes this was forever ago, i replaced vista with kubuntu because it was lighter than gnome at the time) they loved the kde interface and most of what they did was Myspace Tumblr and Facebook, but even they managed to figure out play on Linux and wine after a few months

They are pretty mid in my opinion. Worth trying to see if you like them though.

Depends on the device and the use case, mostly FAT32, exFAT, NTFS, EXT4