I really enjoyed John Muir pubs like How to Keep Your Volkswagen Alive: A Manual of Step by Step Procedures for the Compleat Idiot. They are available for a handful of vehicles (the Subaru one is a favorite of mine). Available at a used bookshop or new.

Great drawings, useful for non-motor-heads. The Sub version has info like resuscitating a drowned lizard :)

Avoid if You hate R. Crumb style drawings and hippies.

Try entering 1566913101 as the search in Amazon, currently USD23.00

Edit, adding: you don't need a specific one to gain great knowledge.

I had this book (and many many many VW's) it was a great help, I did my first valve adjustment with this book in hand.

Pretty sure my dad still has his. I still have memories of his working on our microbus at the time, back in the early '70s. Don't think I was even five, yet, but I remember lying underneath the thing with him, watching while he worked on the brakes(?). And another time, he and Mom working a couple of jacks to pull out the engine.

Yeah, that copy earned its keep. Think it still has some of the grime...

What about learning more about something you already own and use? It would give you an opportunity to have a more hands on, real world experience and if it does break you can fix it?