Pi 4B with 4 gigs of RAM. You might be able to get away with 2gigs because of how well it runs for me, but idk. I didn’t follow any guides for setting up the Pi or LibreElec. It’s honestly super intuitive. Like I said, everything is set up through the GUI. The only slightly technical part is flashing the LibreElec image to the SD card, and even that is super easy. I did follow the Jellyfin documentation for setting up my Jellyfin server, but that’s a whole other thing.