Hi all,
not a question. But rather an answer regarding the mirroring part, that I was facing. So my origination point was not where it should be when I had to mirror.. :) It was mirroring on the wrong side of the mesh. Luckily I had done the Local, Global course stuff and did understand it had to do something with my origination point. Therefor it seems I started my cube not in the center of the universe.. ;). The answer to my problem: Right click and set the pivot point (origination point) in the correct center and shift + cntrl + alt + c. This at least fixed it for me.. :)