Connect the two computers. Use an Ethernet cable to connect your two Mac computers to one another.

Unless one or both of the Macs are iMacs (desktop computers), you’ll need two Ethernet to USB-C adapters to plug into your Macs’ Thunderbolt 3 ports before you can connect them via Ethernet.
Click Go. It’s a menu item at the top of the screen. Clicking it prompts a drop-down menu.
If you don’t see Go, click the desktop to force it to appear.
Make sure that you’re doing this on the Mac from which you want to transfer files.
Click Connect to Server. You’ll find this option near the bottom of the drop-down menu.
Click Browse. It’s near the bottom of the Connect to Server window. A pop-up window with nearby computers will appear.
Double-click the second Mac’s name. You’ll find this in the pop-up window
Enter the second computer’s password when prompted. This will allow you to connect to the second computer.
If this doesn’t work, try using the current computer’s password.
Click Connect. It’s in the lower-right side of the pop-up window.
Open Finder. Click the Finder app icon, which resembles a blue face in your Mac’s Dock.
Move files onto the other Mac. Find a file that you want to move onto the second Mac, copy it by clicking it and pressing ⌘ Command+C, click the other Mac’s name in the lower-left side of the Finder window, open your preferred folder, and press ⌘ Command+V.
http://www.ttechbay.com/2018/06/08/how-to-share-files-from-macbook-to-macbook/