WhatCable: Know what your USB-C cable can really do:
Every USB-C cable looks the same. They are not.
Your drawer is full of identical-looking cables. Some charge at full speed, some crawl. Some carry video, some can barely handle a mouse. The connector tells you nothing. And the cable that worked last month might be the one that has started misbehaving today.
For over a year I thought the USBC port on my extenral display was bad. It wasn’t until I plugged in the proper cable that it suddenly started working again.
Just a great little app.