If light has no mass, how does gravitational force bend light inwards

Question

In the case of black holes, lights are pulled into by great gravitational force exerted by the dying stars (which forms into a black hole). If light has no mass, how is light affected by gravity?

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Answer 1

Big mass changes the shape of space. We call that change “gravity.” Two masses will “fall into each other” because they changed the shape of space. Since space changed shape, light will follow space and will “bend” along that shape.