Is there any way to completely disable the caps lock key without using any third-party apps?
(Virtually, of course—I don't plan on jamming something under the key.)
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Just use the Keyboard pane of System Preferences.
Click "Modifier Keys", and set "Caps Lock" to "No Action".
In System Preferences, go to Keyboard > Keyboard > Modifier Keys… From the popup that appears, you can change caps lock's function to another modifier key, or to "No action."
The options available in the pop up menu: