Let me make a suggestion. If your computer has a decent multi-core CPU, and sufficient memory (RAM), rather than dual booting, consider getting VirtualBox (free) and running one of the operating systems as a virtual machine within the other.
You can do it either way (Windows on the metal and Linux in a VM, or Linux on the metal and Windows in a VM). I prefer the latter, because then backing up the Windows OS is trivial, just copy the VM file to some other drive.
The main advantage of VM'ing over dual booting is that both operating systems are running simultaneously, so programs in each OS can run side-by-side, and you can transfer files and clipboard content between them seamlessly. The main disadvantage is that the CPU and RAM are shared, so if your computer is resource-poor, you're better off with the dual boot so that each OS gets all the resources, just one OS at a time.
If you get some extra time it is well worth playing with the newest version of “Easy OS”. It is delivered as a containerized system that uses images. Very well thought out system that can run complely from a USB stick and leave to traces or be installed to any drive partition.
Fast, light, and basically a VM operating system out of the box. Pretty cool stuff with tons of great tools. Right off the bat it hands you two containers. An isolated root container, and a “working” container. And with one click you can add cloned containers, or images of other operating systems.
And it does not use SYSTEM D! :)