I can't remember if you get access to Student Hub Live before you start your first module with the OU, or after, but they also do useful tutorials regarding essay planning and writing, researching and so on. All of their tutorials are recorded so you can watch them whenever you need to.
They aren't module specific, but I have found them pretty useful for essay planning skills.
Another to look out for are the tutorials run by the library on how to navigate their system, and on referencing.