Source: How-To Geek
Unless you’re prone to yelling on the Internet, you probably don’t use Caps Lock for much. That’s weird since it’s right next to a bunch of useful modifier keys. Here’s how to make Caps Lock as handy as the others.
What Can You Do With an Extra Modifier Key?
Perhaps the coolest thing to do is bind fully custom hotkeys. With the use of an app like BetterTouchTool, you can use an extra modifier key to add an empty slate of hotkeys to which you can attach actions. If you want to trigger a shell script or open a new email tab whenever you press Caps+B, you can do that.
You can do the same custom hotkeys without Caps Lock, but you’ll be stuck pressing weird combinations like Shift+Control+Command to not interfere with default shortcuts. With this method, any app that allows you to set your own hotkeys will support the new Caps Lock modifier.
You can also rebind existing shortcuts to use Caps Lock. If there’s an overly complicated shortcut that’s bugging you, you can rebind it in macOS’s keyboard settings to make it easier to press. For example, the hotkey in macOS to take a screenshot of a selection is Shift+Command+5, but you could rebind it to Caps+S.
Repurpose Caps Lock With Karabiner
Now, there’s no way to emulate an extra modifier key properly, so for compatibility reasons, a better way to get this functionality is to remap Caps Lock to act like you’re pressing the Shift, Control, Option, and Command keys at the same time. Since this is such an absurd combination, no app is going to require you to press every one…
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