How to clean up docker?

Question

Docker

There was an error due to the fact that there is not enough space on the disk
I decided to check how much is free and stumbled upon this miracle

I cleaned it through docker system prune -a
But only 9GB was cleared

Answer 1

Check what you have with the images.
docker image ls
Maybe there are extra, old, unused. Then they should be removed.
docker image rm <image id>