Install Windows 10 as operating system on your Mac via Bootcamp or in a virtual machine
In this tutorial, we'll show you how to get Windows 10 working on your Mac. You need a Windows license and a Mac with enough hard disk space. If you want to install Windows via Bootcamp parallel to macOS, you need at least 40 GB free storage space. If you'd like to use a virtual machine a little less also does it.
The difference between the two variants is as follows: If Windows is installed via Bootcamp, you can either boot up with Windows or macOS. The advantage: Windows runs natively on the Mac and can use the full resources of the Intel hardware. With virtualization, we basically install Windows as another program on macOS. So you can use both systems in parallel. The disadvantage is the limited performance of the guest operating system, because you have to use a additional program, the virtual machine, which pretends to be a real computer.
Both variants have their advantages and disadvantages, so we will explain both here. You have to decide for your own purpose.
How to: Install Windows 10 in a virtual machine
As a program that allows us to install Windows on macOS - the virtual machine - we chose VirtualBox. Advantage: The use is free with the guest system Windows. So the first step is:
In addition, you should have Windows as an .iso file for the desired installation. You usually get it when you download it from Microsoft. We assume that you have a regular license and therefore access to an .iso file or that you have a test version, for example. Alternatively, a DVD works, but then the Mac must have access to an optical drive.
The first step now is to install VirtualBox just like any other program.
A window will open where you can create a virtual machine. Usually it is completely empty, here in this picture there is already one, because we have tinkered around a bit.
For our Windows 10 installation we now create a virtual machine. We are preparing VirtualBox with some settings for Windows so that it thinks that it would run directly on a computer and not on another operating system as in the planned case in a virtualization program. Inception anyone? We select "Microsoft Windows" and "Windows 10" accordingly.
Then we select the size of the main memory. This runs from your real memory. For normal tasks 2 GB should be enough. However, if you have a lot of RAM in your Mac, you can choose more memory to suit your needs.
With the next two setting options you leave it with VDI and dynamic. This creates a hard disk that only grows if it also contains data.
The size of the hard disk depends on what you want to save later. To try it out, around twelve gigabytes are enough for now.
And done! You have created your virtual machine and can now make Windows think it is a real computer. Was quite simple, wasn't it? Now you can start the normal installation of Windows 10 by selecting the machine you just created by clicking on the green arrow.
Either nothing is selected or maybe an .ios file from a previous installation that is no good now. Now select the Windows .ios file, which may be in your download folder.
And here we are in the world of Windows!
Choose the right settings for you and continue.
Windows will ask if we want to do an upgrade or custom installation. Since we start from scratch and have no data to take over, we select "Custom".
Next, you can select the "hard disk" that we created earlier when we created the virtual machine especially for Windows.
You will be asked for an email address and account at Microsoft. You can either enter this if you have it or not. Windows should offer (at the latest after wrong entries) the option to start it simply with a local account. That should be enough for now.
After that you just have to be patient...
...until finally the Windows Desktop appears. Top tip at this point: the "command key" is the "Windows key", so that you can call up the start menu. 
How to install Windows 10 on your Mac with Bootcamp - Instructions
The installation via Bootcamp is a bit easier. On the one hand, Apple provides us with Bootcamp, on the other hand we don't have to fool Windows - it can run natively on our hardware. Again, it is clear that we should have a Windows .iso at hand, for example in the download folder.
Then we open boot camp. This is simply the program that Windows installs us parallel to macOS. You can find it in Programs > Utilities > Bootcamp.
Very good. Now you have to set how much memory Windows is allowed to use. Apple plans at least 40 GB.
Bootcamp will then download the appropriate Windows drivers for the Mac hardware.
And then repartition the hard disk according to our settings. This could take a few minutes. You will be asked for your password again to be on the safe side.
Then the Mac restarts and greets you with the Windows logo, so don't be frightened 
First of all you can make basic settings here again.
Then the usual waiting follows.
Regional settings and
the connection to the network.
Then the Windows 10 Desktop welcomes you.
The Bootcamp Installer then does some more work and restarts Windows.
Now two more tips: If you have the same font size as in macOS, you can set the font size to about 175%. That's going well.
If you miss Tap-to-Click and other settings, you will find them in the lower right corner of the taskbar. Click on the Bootcamp logo, then on "Boot Camp Control Panel".
And finally, the most important thing: when restarting the gong, keep the "alt key" pressed. Then you get the choice between the now installed Windows and macOS.
