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Im doing an essay on time travel, and as of yet have done nowhere near enough mathematical stuff to be able to grasp the mathematics behind these concepts.

but anyway I was looking at wormholes and I think Im right in that in quantum foam you get loads of little wormholes among other stuff.

What was confusing me was I've read people say this stuff is totally real, but then at the same time say at this scale space and time cannot be defined. how can something that cant be defined be real? am I just confused or should I stop using youtube for research?

and if spacetime is quantised or whatever, does this mean that quantum foam isnt really there, would the minimum size? of spacetime be big enough that you never saw all the tiny wormholes and tiny universes and stuff?

thanks in advance for any answers