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+### Migrate to a Newer Version of Nixpkgs
+```bash
+# Determine the channel name you're using
+nix-channel --list
+nix-channel --remove <OLD_CHANNEL>
+nix-channel --add <NEW_CHANNEL> # ie https://nixos.org/channels/nixos-25.05
+nix-channel --update
+
+# Now upgrade system profile (log to file in case of failure)
+nixos-rebuild boot --upgrade | tee rebuild.log
+```
+
+### Finding New Things to Do
+`man 5 configuration.nix` is incredibly useful
+	similar info can be found at https://mynixos.com/options
+
+### For your curiosity
+1. https://wiki.nixos.org/wiki/Firejail