Why not? When I joined a Discourse forum, I received a welcome message, which included a link to the blog of “Discourse”.
… You’ll gain new abilities …
From there, it’s not difficult to stumble across this forum. For example, the comments of the blog post take you here. So I did nothing more than read the welcome message and the information provided in it. I don’t think you need to be more than a regular end user for that.
By the way, this tutorial also told me some basics about how to format my posts and even included a link to a markdown tutorial. I didn’t know markdown, HTML, and BBCode before.