Space is defined by the objects which give it definition. This means that space itself is non-existent but for the objects which define it.
Time is not a physical dimension. There are only 3 physical dimensions in reality.
Spacetime is a fake scientific concept. The idea that spacetime can warp is even more fictional. Why not spacetime heating up? Why not spacetime getting cold? Why not spacetime moving? Why not spacetime... on and on and on.
Spacetime is pseudoscience.
Let me be clear though, special relativity, meaning objects that we see in the night sky are not actually as we see them because there is a limit on the speed of light (but it is not a constant). Special relativity makes sense, but spacetime warping? Spacetime bending as an explanation of gravitation? Nope. It is nonsense. We can safely reject general relativity because it is worthless trash disguised as science.
So in short:
Special relativity describes the relationship between space and time. (science)
General relativity is a theory of gravitation by combining space with time, thus negating their actual meanings. (pseudoscience)