Space-time is an operating system on which the universe is running, the system is not rigid but malleable, denser in some places in others – relaxed/flat, still it has laws, physical constants and hard limits that allow matter and fundamental forces to interact with one another in an extremely specific way.
To answer what space-time is made of you’ve got to wrap your mind around the concept of probabilities and most importantly how they are not subject to relativistic effects i.e. probabilities work within the universe but they don’t need it to exist, this leads one to think they must be more fundamental than space-time. Another important concept to consider is how probabilities can form interdependent variable systems and by doing so become self-contained objects that appear to have qualities different than the sum of their parts when in relation to other similar objects – these would be particles.
Matter, energy, information – these are all interchangeable, where you have high concentrations thereof you naturally have denser space-time as a direct consequence because everything is made of the same stuff really.
Space-time is not physical in the usual sense in that in order to understand what it is you’ve got to measure it from outside of space-time, nor is it just a concept people use to collectively refer to effects they measure, it’s like the inside of a bubble.
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