I've never used the Mac OS. In my work place there is 3 or 4 Macs. I'm not required to use them but I'd like to get to grips with them just encase they have any problems.
Anyone know any guides on using the Mac OS?
What kind of guides are you looking for? Guides on how to some specific task? Or some overall guide/book/manual on how to use the Mac OS?
If it is the former, then my suggestion would to just Google the specific task you want to do/learn and you will likely get a number of guide/tutorials listed...both written and probably videos.
If it is the latter, then you might want to either get one of the Missing Manual series books (each version of the Mac OS has it's own book) or maybe one of the For Dummies books (there is a generic one coving Macs overall and OS version specific ones). The other option is a Take Control series book...they have eBooks for a number of Mac related topics.
The other overall option is just start using one of the Macs. In reality, the Mac OS is very similar to Windows (except for the new Modern interface side of Windows 8) for most things. There are subtle and not so subtle differences that might frustrate you, but if you encounter some thing that you need help with, then just ask.