A few years back, Apple removed traditional USB ports and went to something called USB-C. This makes everything incompatible, including HDMI & Ethernet cables. You will need an Apple USB-C Digital AV Multiport Adapter: https://www.apple.com/shop/product/MJ1K2AM/A/usb-c-digital-av-multiport-adapter?fnode=85&fs=f%3Dadapter%26fh%3D459d%252B45b0. Other generic USB-C adapters that can be found through online retailers may also work.