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My understanding as to why entities are attracted by gravity is that the spacetime gets curved around them. Curved in such a way that a path “straight forward” in time gets curved so that it’s actually “toward the other one”.
Now why the spacetime gets curved is anyone’s guess. But the fact it’s attractive has to do with bending the road underneath the car. A car with its wheels pointed straight can be turned if you curve the road in the right way. It would look like the car is “steering without steering”.