The theory of general relativity says numerous things. But the main idea is that gravity is because of curved space-time. If space-time is bent, then a light beam must be bent by a massive object-and yes, this actually happens. However, there is another effect in the theory of general relativity: you can’t tell the actual difference between acceleration and also gravity.

Suppose you have two rockets (without any windows). One of the rockets is at rest (and not accelerating) on the surface of Earth where this gravitational field is 9. 8 N/kg. The other rocket is deep space and increasing at 9. 8 m/s2. In both rockets, a person throws some sort of ball.
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