There are a couple of books you should leaf through and possibly buy one of them.. One is published by Woodalls or Good Sams and sold at Camping World, among other places, The other is sold other places.
One is titled: The RV Book
and as I recall the other is: The RV Owner's Handbook.
These are both "Generic user's Manuals". and they do a fairly good job of describing many of the systems on your motor home.. On a couple of them they are actually BETTER than the factory manual as they were written BY RVers for RVers nto by engineers for other engineers.