To identify your computer's processor, memory, and macOS version, choose Apple menu > About This Mac.
Internet connection required for product activation, select features, and online updates.
One of the following:
Windows installation media.
Note: If you don't have Windows, Parallels Desktop can help you download and install Windows 10.
An Internet connection to download and install freely available operating systems such as Ubuntu, Fedora or other Linux systems supported by Parallels Desktop.
A macOS recovery partition that can be used to create a virtual machine with the guest version of macOS.
A Windows computer to transfer to a virtual machine and use it on your Mac alongside macOS.
The Boot Camp partition with Windows to create a Boot Camp-based virtual machine.