1) Caps Lock = Hyper
Caps Lock is taken over as a Hyper modifier (cmd+ctrl+option+shift).
This is the most popular solution and many utilities can do it, but it matters to me that everything related to input lives in one place. I want Karabiner to be responsible for the “keyboard hardware”. So I set Hyper at this level too.
Karabiner has exactly one job here: to replace Caps Lock with a combination that’s almost never used. This turns Caps into a handy “super key” under the little finger and gives a large clean layer of hotkeys.
I’m attaching the JSON file with the modification
Next I’ll show how Space-hold turns into a layer of commands (hotkeys).