I hope no one says dongles lol. My favorite accessory is actually Magic Trackpad, which may seem odd because there's already a huge trackpad on the 2019 base model which I have. But I like placing the trackpad to the right of the laptop. It also serves as a "remote" for me. When I'm laying down on the couch and have my MacBook Pro on the table at a distance watching news and TV, I use my magic trackpad as a "remote" Very useful.