Remapping keys
Sometimes keys annoy you and you keep typing incorrectly, e.g. from being used to a Windows keyboard or similar.
Plus CAPS LOCK is pointless.
In my case I kept hitting right alt instead of right command. So I made right alt to also be a command key.
hidutil property --set '{"UserKeyMapping":[{"HIDKeyboardModifierMappingSrc":0x7000000E6,"HIDKeyboardModifierMappingDst":0x7000000E7}]}'
That's all it takes.
List of keys here:
Command syntax is here:
https://developer.apple.com/library/archive/technotes/tn2450/_index.html