The original Markdown specification (if you can call it that) has some pretty extensive user-focused documentation, detailing how to use Markdown in places that support it. Obviously though that site doesn't include the extensions to Markdown which exist in Standard Markdown, such as fenced code blocks.
Does Standard Markdown have a user-focused reference guide or basic tutorial? If not, should there be one?
There is discussion of this in a few other topics here but I agree, standardmarkdown.com should have user focused documentation as well.
