I haven't turned my attention to networking as I had only the one computer. In all honesty the only networking I've done was to get a couple of Windows 7 computers to talk to each other, and got my laptop to talk to my girlfriend's computer via her router, both were Macs and so long ago. I purchased another computer and want to transfer files between them. Kali is on both, and now have use for learning some networking as well as getting these two machines to talk to each other. When I use Kali's network manager it lets me see my connection, ethernet connection, and to modify that, but no other connections. How do I see the other machine and the router and begin the process of networking the 2 computers and the router?

Thank you