I dunno if this is the right place to post this topic but here goes
My knowledge in this subject is limited to what I've seen in Spiderman

Ok, so I like watching cartoons (lol). I've tried researching on the subject and I find it hard to seperate what is SCIENCE from what is SCIENCE FICTION
Do Multiverses mean that there are another handsome chaps who look exactally like me, but they live in diferent realities? Would they share the same DNA, fingerprints, etc, etc, like me? How do they work? Do they occupy the same space as we do?
Plus: what books would you recomend me to read on this subject (preferably light books and easy to understand)?