Using Caps Lock as Esc in Mac OS X

Question

How do I make Caps Lock work like Esc in Mac OS X?

Answer 1

It is now much easier to map the Caps Lock key to Esc with macOS Sierra.

1. Open System Preferences → Keyboard.

2. Click the Modifier Keys button in the bottom right-hand corner.

3. Click the drop down box next to the hardware key that you’d like to remap, and select Escape.

4. Click OK and close System Preferences.

https://9to5mac.com/2016/10/25/remap-escape-key-action-macbook-pro-macos-sierra-10-12-1-modifier-keys/