I was looking for a way to connect my two Mac Minis and transfer files between them, see the other Mac’s desktop and etc.
People were suggesting, FireWire, Thunderbolt cables, etc. Save your money. None of that really works.
The solution? Good old Gigabit Ethernet (CAT5E) cable and connect the two Macs together. Even if you have the latest MacBook Pro or MacBook Air that don’t have Gigabit Ethernet ports, there are Ethernet to USB cables that you can get from Apple which will do the job for you. So you still use the ethernet cable but at both ends or 1 end use the Ethernet to USB cable. Easy peasy.
In case you don’t know what an Ethernet cable looks like, it’s like this: