How does gravity work in your opinion ?

My guess is not "wild," it has been confirmed by many rigorous and measured observations. [See source.] Gravity effects are due to warped space in the presence of mass, energy, and/or stress. Check out the image for a representation of how space curves in the presence of mass for example.

This is not my WAG, it's the general theory of relativity. And the GTOR has been tested over the decades many times; it's never been found to test false. So it's a true theory.

Particle physicists still cling to the notion that gravity effects are carried by gravitons, gauge mediator bosons. But to date there have been no...no...tests or detections to validate that hypothesis...unlike the GTOR model that has had many validations.

In fact I would assert there is actually a clue that the particle theory is invalid. Why? Because in theory, the graviton ought to be stronger than it is in testing gravity forces. Some, like Lisa Randall, say that's because some portion of graviton exist outside our universe. But I think the real answer is that the graviton model is invalid. Warped space causes those effects, not particles.

I believe it has to do with the mass of objects. Also their weight.