WAN Port on Router Explained - What is it and How to use it
Amazon.com: AmpliFi HD WiFi System by Ubiquiti Labs, Seamless Whole Home Wireless Internet Coverage, HD WiFi Router, 2 Mesh Points, 4 Gigabit Ethernet, 1 WAN Port, Ethernet Cable, Replaces Router & WiFi
Amazon.com: Monoprice USB 2.0 Ultrabook Ethernet Adapter (Low Power), Supports Windows and MacOS : Electronics