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 doesn’t bend light because light doesn’t weigh anything; gravity bends the road light travels on. You specifically asked about black holes. Anything heavy sitting on a bed makes a dent in the bed, which bends the stripes on the bedspread around it. Anything heavy in space makes a dent in space, which bends the rays of light around it. A lightweight dent is shaped like a bump. A really heavyweight dent is shaped like a funnel. A really, really, really heavyweight dent is shaped like a hole. The bedspread stripes on the sides of a hole run in circles around the hole and never lead back out. That’s a Black Hole: where space is bent so much that all “straight paths” inside it are bent into circles that never point away from the center. It’s like laying a balloon flat, crawling inside it, drawing straight lines on it, and having someone else inflate it and tie it shut with you in there. All the lines that were straight when you drew them now just lead around the inside of the balloon. That’s “bent space”, a black hole.
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