I'd recommend NixOS, for non expert users.
If you are interested in 'what' and not in 'how' or 'why', then declarative nature of Nix configuration will do nicely.
It can be as simple as
services.nfs.server.enable = true;
services.nfs.server.exports = '' /export 192.168.0.0/16(rw,no_root_squash,insecure,no_subtree_check) '';