Simple things are easy :D But running docker, with multiple images that should interact withanother and with the public and it now it gets complex.

"Just docker run" is not always the answer

Look at Radarr:

https://radarr.video/#downloads-v3-docker

It's nice that they give tipps about pitfalls, but there are more than this and a step by step tutorial would also be good.

Often times you have to google and search 10 reddit posts. Thinks like digitaloceans tutorial work best.