macbook pro cable question

If you have wi-fi or an ethernet router in your house you can connect them both to the same network via wi-fi or via standard ethernet cables to the router (i.e., not directly to each other). If your new one only has USB-C and you want to use ethernet: The Belkin USB-C to Gigabit Ethernet Adapter - Apple

If you want to use target disk mode instead, see the following: How to use target disk mode to move files to another computer - Apple Support

Also see: How to move your content to a new Mac - Apple Support

If both computers have Ethernet ports, any which physically plugs in. If the new one has only USB-C ports, get a USB-C to Gigabit Ethernet adapter.

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The best way to do this transfer is to connect BOTH computers to Ethernet ports on your Router.

You will also need to enable File Sharing:

System Preferences > Sharing > File Sharing ...

... and specify what should be shared. (default is the Public Folder.).