Clean install of Mojave
How can I do a clean install of Mojave onto a new hard drive?
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If you are installing on a system with a single hard drive you will need to make a bootable installer for the device.
How to create a bootable installer for macOS - Apple Support
Boot from the installer USB flash drive you created
How to select a different startup disk - Apple Support
Open Disk Utility
Disk Utility for macOS Sierra: Erase a volume using Disk Utility
If you are installing to an SSD drive you will need to format AFPS
For mechanical HDD drives format using Mac OS Extended (Journaled)
Choose GUID Partition Map
Then select Erase
Quit out of Disk Utility and run the installer
See also
Upgrade to macOS Mojave - Official Apple Support
Install macOS 10.14 Mojave on Mac Pro (Mid 2010) and Mac Pro (Mid 2012) - Apple Support