Question

How can space be endless?
Space must have some space to expand into right?

Answer 1

it's not clear yet...as we cant travel to see its limitations...so its beyond our actions so we assume it

Answer 2

Two possiblities:- either the Universe is finite and has a size, or it's infinite and goes on forever. Both posiblities have mind-bending implications. The space may be infinite, but we can only see a finite section of it due to the finite speed of light.