Q: synchronise MacBook pro with MAC mini

Okay ... Ethernet and WiFi ... and how does that work? Booth are in my Network but the MBP can't see the mini and the mini doesn't see the MBP. What do I have to do that they are linked?

that could maybe help but my system is in German and there is no app called "file sharing". I think my first problem is that I don't have a real network? My MBP is connected with WiFi to the internet and my mini with Ethernet cable. Booth using the same Internet connection. Is there somewhere a test routine checking if there is a network or not?

Sorry, seems I am too stupid for Mac, it's my first one. I found it it's called "Freigaben" in the German system. And it works!

Thank you! You put my nose on the right side.