docker ps

Which containers are running?

docker ps

Which containers have run in the past

docker ps -a

How to delete

docker rm *container_id*

How to clean all containers the old way

docker rm $(docker ps -a -q)

the new Way

docker container prune

docker images

Which containers have i downloaded?

docker images

How to delete

docker rmi *image_id*

Force will delete also all containers relying on the image

docker rmi -f *image_id*

Delete all images

docker image prune -a