Eistein’s general relativity theory is indeed a groundbreaking theory in physics and astronomy.
Considering, a planet is orbiting a star.
Generally, we look at them like this, from top down.
As you can see, the small planet orbits around the star clockwise. But that is set the frame of reference at the center of the star. Or the center of mass of the star.
If you set the frame of reference at the planet: