Installing Windows
Dual-booting Windows w/ Bootcamp
On Intel macs, you can use Bootcamp Assistant to easily dual boot windows. Depending on the macOS version, bootcamp will offer different Windows versions. Bootcamp automatically installs needed drivers for Windows.
Consult the apple documentation for bootcamp version information and downloads.
Note
You cannot rollback macOS to a version that existed before your machine, so you cannot install a version of Windows supported by Bootcamp in a previous version of macOS that came installed with your machine.