RV are very different than cars or trucks and that makes looking for info very different. But it also depends what type of info is needed as we get some great info from Winnebago on the things they add or wire to on the stripped chassis they buy.
Wiring plumbing and parts of the "house" they build on top are online.
But just like a stick built house, we have to go other places to get info n things like the frig, water heater or furnace.
Pretty much everything that has a different brand on it has info from the folks who built that item. There should be a big folder full of those manuals and booklets but they often get pitched when RV changes hands and we then have to start our own little library of info!
I can give you a good start on the Winnebago items as they do one of the better jobs of sharing that online!
Plumbing:
https://www.winnebago.com/Files/Files/Winnebago/Resources/Diagram/Plumbing.htm
Electrical:
https://www.winnebago.com/Files/Files/Winnebago/Resources/Diagram/Wiring.htm
And then, you may also find it a big help to look at an interactive parts catalog. Not so much to order parts but to find where or what an item might be! If you do need a part, having the correct name and a part number can be really nice!

Sometimes you see an item and wonder what the heck is THAT!

So finding it on the drawings and clicking on it, will make the part name and number come up on a list at right! Or if you know what it is, click on that name on the list and it pops yellow on the drawing, so then you know where to look! Hint? Keep clicking on the name makes it flash yellow on the drawing as a way to spot it quicker!
https://catalog.winnebagoind.com/menu/Parts.htm
But that will still leave a big group that you may not know much about. Things like how to operate and what to expect from the furnace?
Owners manuals can be a start and they can be found under the Winn home site and owners tab:
https://www.winnebago.com/
That takes a bit more study if you need deep info as first you need to find a label on the item for brand and model number! Armed with that info, I then do a search for brand and model for an owners manual or often getting repair help.
Not easy as there are often tons of different places to get what might seem so simple at first.
Like heat and air? The thermostat is one, the furnace is another and the air is often a totally different company!
That's why I promote the idea that people who throw out the manuals should be nailed to a post somewhere! Or at least stay around until something needs fixed?
But what makes a forum fun is that we get to talk to all kinds of people with all kinds of experience and that often leads to all of us learning more!
Enjoy the trip and hope that helps a bit!
