There's a useful reference here:

https://forum.digikey.com/t/an-unofficial-discourse-user-reference-guide/1125

Missing from this reference, though, is how to create collapsing text blocks like the following:

[details="Don't be scared!"]
Boo!
[/details]

    [details="Don't be scared!"]
    Boo!
    [/details]

If you're ever curious about how *another* post was marked up, it's possible for you to view its markup directly. For example, to view the markup for my current post, note the post's URL by hovering your mouse over its timestamp in the upper-right corner:

[https://forum.manjaro.org/t/request-for-forum-tutorial/5693/10](https://forum.manjaro.org/t/request-for-forum-tutorial/5693/10)

Then, to view my markup, go here:

[https://forum.manjaro.org/raw/5693/10](https://forum.manjaro.org/raw/5693/10)