all files deleted from hard drive how can i install os
all files deleted from hard drive how do you reinstall os monterey
MacBook Pro
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It helps to know the exact model of the Mac as well as the version of macOS previously installed. To get the exact model of the Mac enter the system serial number here:
Check Your Service and Support Coverage - Apple Support
Here is an Apple article with some general instructions for reinstalling macOS:
How to reinstall macOS - Apple Support
If you have access to another Qualifying Mac, then you may also be able to create a bootable macOS USB installer assuming the Mac with no OS is able to boot from USB. Booting from USB is disabled by default on 2018+ Macs and must first be enabled by using the Startup Security Utility only available from Recovery Mode or Internet Recovery Mode.
About Startup Security Utility on a Mac with the Apple T2 Security Chip - Apple Support
If you have a 2018+ Mac and you have access to another Mac running macOS 10.15+, then you can "Restore" the firmware which will push a new OS onto the internal drive of the Mac.
Revive or restore an Intel-based Mac using Apple Configurator - Apple Support
Revive or restore a Mac with Apple silicon using Apple Configurator - Apple Support