Yes, I know it is a major sin to install Windows 10 on a Mac. But sometimes, one cannot help but too because of school, work, or some other reason.
Fortunately, Macs have a way to make this process as painless as possible, without turning the entire Mac in to a Windows system. It’s called Boot Camp.
Boot Camp comes with all Macs and allows a user to make room (called a partition) for Windows to install and run just like it was on a PC.
In order for this to work, a user must have access to a full version of Windows 10.
If you’re Mac doesn’t have a built-in CD/DVD-ROM drive, you can purchase and download a full copy of Windows 10 directly from Microsoft (http://www.microsoft.com/windows).
After you purchase it, download it in to your Download Folder. The copy must be fully downloaded before you can go on to the next step.
Now is the time to go into Boot Camp and begin the installation process.
For that, go in to: Finder > Applications > Utilities > Boot Camp.
When Boot Camp starts, it will show you a current map of your hard disk, and will recommend the amount of disk space Windows 10 needs to comfortably run on your computer. (I’d suggest using 50% for Mac, and 50% for Windows).
Next, it will ask you where a copy of Windows 10 is. Select the location where you’ve downloaded the copy and click OK.
Finally, Boot Camp will begin the process of installing Windows.