I personally think the advanced user tutorial should be merged with the main tutorial. But I don’t know if this is a thing that can be changed. I personally found out about the advanced tutorial after some months of use in which I already learned the tricks via other ways.
Missing from this reference, though, is how to create collapsing text blocks like the following:
Don't be scared!
[details="Don't be scared!"]
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: