How to install Windows on your Mac using Boot Camp Assistant
Mac Pro 2013 or later modelsMacBook Air 2012 or later modelsMacBook 2015 or later modelsMacBook Pro 2012 or later modelsMac mini 2012 or later modelsiMac 2012 or later modelsiMac Pro
To begin, go to Applications > Utility or Launchpad on your Mac and open Boot Camp Assistant.Then press the Continue button.Choose a Windows 10 ISO image to install on your Bootcamp partition.
Then, by moving the slider from right to left, change the size of the Windows partition. According to Apple, the recommended partition size is at least 128 GB.Install should be selected.
Bootcamp will now partition your hard drive and start the Windows installation. After a restart, you can install the Windows 10 operating system by following the on-screen instructions.
Press the Alt (or Option) key immediately after pressing the power button to boot to macOS or Windows. This brings up a screen where you can choose which partition to boot from.