I've bookmarked directions for it. For the admittedly out-of-date High Sierra, for instance: https://www.howtogeek.com/285922/how-to-create-a-bootable-usb-insta

I've bookmarked directions for it. For the admittedly out-of-date High Sierra, for instance: https://www.howtogeek.com/285922/how-to-create-a-bootable-usb-installer-for-macos-sierra/ https://www.howtogeek.com/285922/how-to-create-a-bootable-us...