I have just finished a nice little Docker tutorial from Taylor Lovett. If you are just getting started with Docker, then I recommend you have a look at his tutorial.

https://scotch.io/tutorials/getting-started-with-docker

I’m using Docker on Ubuntu, by the way. Here’s a tutorial specifically for Ubuntu.

https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-16-04

Ein Tutorial auf Deutsch: Grundkurs Docker – https://jaxenter.de/einfuehrung-docker-tutorial-container-61528