Update README.md

README.md

@@ -16,3 +16,16 @@ https://gist.github.com/FlakM/0535b8aa7efec56906c5ab5e32580adf
 
 # Building NixOS ISO
 `nix build .#nixosConfigurations.live.config.system.build.isoImage`
+
+# Misc
+## Garbage collection
+`nix-collect-garbage -d`
+## Fonts
+### Checking installed fonts
+`fc-list`
+### Debugging kitty fonts
+`kitty --debug-font-fallback`
+
+## SDDM virtual keyboard ??ZZ
+- https://unix.stackexchange.com/questions/43976/list-all-valid-kbd-layouts-variants-and-toggle-options-to-use-with-setxkbmap
+- https://github.com/NixOS/nixpkgs/issues/254523