gravity is the attraction of anything with mass to anything else with mass.
the space/time relativity theory is how gravity and time interact, which isn’t necessary to ‘use’ gravity in the engineering/newtonian models
as for how gravity works.. their working on that, it’s being studied by numerous quantum physics labs and it is in no way easy to explain what i think i know about what they think they know about graviton waves. https://en.wikipedia.org/wiki/Gravitational_wave
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