I have been to the formatting reference, and the http://meta.stackoverflow.com/editing-help
None of which shows me how certain things on done on the site. Is there a way to view the ML used to generate a post? I think that allowing other people to look at a posts' markup would be the fastest way to learn. Perhaps when I have high enough rep to edit other people's posts or topics I can look then?
I have no idea how those key shortcuts were made.