On the documentation page their is a link for “Tara Walker’s “Building a Shooter Game” tutorial series.” which I found quite helpful.
However part 6 links to:
http://blogs.msdn.com/b/tarawalker/archive/2013/08/26/windows-8-game-development-using-c-xna-and-monogame-3-0-building-a-shooter-game-walkthrough-part-6-creating-enemies-and-detecting-collisions.aspx
Which is actually missing all the content for her part 6.
It does link to what I assume was her original homepage:
http://www.tarathegeekgirl.net/?p=281
Which is no longer online.
With a bit of digging, I found a cached copy of that posting via bing:
http://cc.bingj.com/cache.aspx?q=url%3Ahttp%3A%2F%2Fwww.tarathegeekgirl.net%2F%3Fp%3D281
Just thought that would be helpful in case anybody else got to part 6 and was disappointed.