New guy trying to wrap his head around CNCs

Hello everyone! I am an electrical engineering student from Germany, and I like to build my own devices in my free time. For this purpose I already own a 3D printer, but I want to now get a CNC machine to be able to machine a variety of other materials as well.
When it comes to know-how, I can deal with electronics just fine, but I have only got limited mechanical experience, and mostly theoretical at that.
I have been looking at mostly entry-grade machines (eShapeoko, MPCNC, etc), and in the wake of my research I was referred to this forum.

I hope that I can get the help I need here, and be a member of this community when I actually get a machine.