Docker compose is how you can define a set of services and then run them. Those services are defined in a yaml file. Most programs provide their own way to be ran through docker compose. Env is a shorthand for environment, basically values you pass to customize the services.

this sarcasm or ya actually in the know?

I’ll be honest, only the first setup gave me some trouble as I was tackling docker compose too. After you gain familiarity setting up a new arr is basically copying the provided yaml service then filling in the envs with yours