Download the ISO file for the operating system you want to install
Insert a USB drive with enough storage
Back up any files on the USB drive
Open a bootable USB creation tool such as Rufus, balenaEtcher, or the built-in disk utility on your system
Select the USB drive in the tool
Select the ISO file
Choose the correct partition scheme and file system if required
Start the writing process
Wait for the process to finish
Safely eject the USB drive
Use the USB drive to boot the target computer from the boot menu or BIOS/UEFI settings