I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!
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How to make an application icon for macOS using
iconset
&iconutil
- Shut down your Mac, then press and hold the power button until "Loading startup options" appear.
- Select "Options"
- In the menu on top of the screen, choose "Utilities" -> "Startup Security Utility".
- Click "Security Policy"
- Select "Reduced Security" and check "Allow user management of kernel extensions from identified developers".
- Reboot