I don't understand how this could be flagged as a dupe. I agree both articles cover Portainer.
But one goes deep into how to set it up with deep integration on Docker Machine and DigitalOcean on a more expert level.
While the other provides a very simple beginner level Play with Docker setup and then goes on how to install an entire application stack, with frontends, databases and workers.
Yeah, the gist of the article was just to show some of the capabilities. In essence, Portainer is just a wrapper around the Docker API. So I wouldn't use it as a management tool, much rather as a quick and dirty checkup tool.