Most up to date guide for XPS 15 9560 dual boot

Hello,

I would like to dual boot Mac OSX with my existing Windows 10 OS in order to use Xcode for programming iOS apps. I have a Dell XPS 15 9560.

I was wondering if any of you knew where I could find an up to date guide (needs to be a version of Max OSX that can run at least Xcode 9.2). Or perhaps you could give me some tips?

I don't want to do anything illegal and I heard it is best to buy a licence for $20, is that true?

Are there any disadvantages to dual booting?

Is this something I should use? Not too sure about it since apparently I won't be able to use my Nvidia GPU or Wifi?

Thanks.