Please follow the steps below to find out how to create a bootable media device for Windows 10. To boot into Windows 10, you need a Bootable Media Device.
Once the partition has been created, you now want to boot into Windows 10. Make sure to choose the 'MS-Dos (Fat)' or 'ExFat' option for your format. Name your to partition whatever you want, I named mine Win10. If you are using an old version of MacOS X, you might not have the ability to choose the size of your partition. Please be sure to choose a minimum of 30GB for your partition size, as this will be the boot of your new Windows Partition. If you are using a more recent version of macOS, you will have an option to choose the size of your partition. Once on the tab, select the '+' button, a pop-up screen will appear. Select the Hard Disk of your choice, and select the 'Partition' Tab. Be sure to back up your Mac to prevent any major damage. Only do the following if you are the administrator and owner of your Mac. Please perform these actions at your own risk. Please Note: This method is not encouraged by Apple and may lead to your Windows OS to fail, resulting in a major loss of data.
However, I will guide you through the correct steps to accomplish this. Installing Windows without using the Bootcamp app is risky.