waveshare Pi Zero to Raspberry Pi 3 Model B/B+ Adapter, Onboard 4-CH USB Interface, 100M Ethernet Port and HDMI Port, Alternative for Raspberry Pi 3B/B+, Support Pi Zero and Zero 2W

Simple solution to make a little pi a little more functional. I use this to run octoprint on an old Ender 3d printer I bought. Works fine despite the constant warning from octoprint that it's not supported, and "never has been". I laugh every time the notification pops up. Obviously it works for other applications as well, worth mentioning that it does not make the Pi zero any faster or anything like that.

Works as advertised and adds the ports you need. And it's easy to remove when you don't need the ports.