I type this on my Macbook Air which I can connect easily to the router by ethernet cable - I often do so to check speeds - its not difficult.
Get a USBc to RJ45 etghernet adapter and a length of Cat6 cable.
--------------------
John
--------------------
I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.