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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Gravity distorts spacetime, meaning it’s not the mass attracting other mass, it’s the mass deforming space, through which the light has to travel.
Think of it like a car on a road: if the road is straight, the car goes straight. If the road is curved, the car follows the curve (hopefully).
Gravity doesn’t affect the car, it affects the road the car travels on.
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