FWIW, I've ordered myself a 13" MacBook Pro and haunted the Amazon reviews for adapters that should work properly with it. This was more complicated than I thought it would be. I ended up with:

Assorted adapter dongles:
https://www.amazon.com/Dell-Adapter-Type-Ethernet-470-ABQN/dp/B012DT6KW2/
https://www.amazon.com/dp/B019R9KAUE/

(Nobody makes a single dongle that has everything, so I'm instead getting two different dongles that each seem to do useful things.)

Charging cables (2x):
https://www.amazon.com/Griffin-BreakSafe-Magnetic-Breakaway-Chromebook/dp/B01CQTK6GU/

Spare charger (half the cost of the same thing from Apple):
https://www.amazon.com/Anker-Delivery-Charger-PowerPort-MacBook/dp/B01M19TP4H/

And, of course, after I order that Anker thing, there's an Amazon review for it saying that it's not compliant with all the USB-C PD specs. Arrrggggh.