I wanted to start running Home Assistant using Docker (on my main server instead of a dedicated Raspberry Pi with Hass.io) and came across this page [0], search for "Docker Compose", I copied the yaml, ran docker-compose up -d and boom. Shortly afterwards I added mosquitto and sabnzbd to the yaml and all three now update very easily and everything became very portable. Before I was keeping docker commands somewhere in an md file.

Edit, I hope to learn Traefik reverse proxying in one hour next ;)

[0] https://www.home-assistant.io/docs/installation/docker/