1.1. Get USB stick (USB2 works better than USB3) that is 8 GB or a little bigger (not too big like 128 GB)
1.2. Download Rufus https://rufus.ie (or BalenaEtcher https://etcher.balena.io)
1.3. Download some live distro, for example:
1.4. With Rufus of BalenaEtcher, write .iso to USB stick
1.5. Boot from USB Linux Mint, usually after power on F8 key is boot menu, or F12
Windows 8 and Windows 10/11 OEM product key from BIOS when using Linux
sudo cat /sys/firmware/acpi/tables/MSDM | tail -1
2.1. Download Rufus https://rufus.ie
2.2. Download Windows, big download
https://www.microsoft.com/software-download/windows11
https://www.microsoft.com/fi-fi/software-download/windows10ISO
2.3. If you are installing Windows to VirtualBox, newest VirtualBox has TPM 2.0 and Secure Boot emulation.
Win11 on VirtualBox may have some visual transparency bugs, that updates to VirtualBox display drivers may fix later. Earlier OS shows correctly.
2.4. If you are installing Windows 11 to computer that does not support Windows 11
Try adding some Windows Registry keys: https://blogs.oracle.com/virtualization/post/install-microsoft-windows-11-on-virtualbox
2.5. Boot from USB Instal Windows stick, usually after power on F8 key is boot menu, or F12
2.6. If using same license key at dual boot:
If some activation phone call asks in how many computers you use license at, answer 1.