Honestly, for those tools, I’d recommend posting in [email protected].

Echoing some other comments, those are decently complex tools all around. I’d recommend doing a few tutorials on docker before trying out that project (short ones, just to build a mental model).

As others have said, docker is a command line tool. docker -v in your terminal should be enough to “find” it. That’ll show you the version of docker you have installed.

From there, I’d recommend the hello world image to start (this should get you there https://www.geeksforgeeks.org/docker-hello-world/).

From there, keep messing with it. Get more familiar with docker through their docs. Read a bit on images vs containers, port mapping, and volumes and mounts.

As others have said, look for docker only in the terminal. And then expect to spend a little time familiarizing yourself with what problem docker solves and how it solves it. Once you’ve got docker in your back pocket, you’ll be very well situated to set up all kinds of apps.

And when you run into other problems, there’s communities to answer and work through the issues

I skimmed the guide you sent and the top says that the portions in brackets are placeholders and need to be replaced with real values. If you change {{ lemmy_docker_image }} to be the name of the image to use dessalines/lemmy:0.18.0 for example, do you get further