Some think black holes are like cosmic vacuums that suck in the space around them, when in fact, black holes are like any other object in space, albeit with an extremely strong gravitational field.
If you replace the Sun with a black hole of equal mass, the Earth would not get sucked in, it would continue orbiting the black hole as it orbits the Sun.
Black holes have so strong gravitational field that can even bend light, the fastest thing known to exist in the three dimensional planes. Black holes can even bend space and maybe distort the dimensions in ways we still don’t know and maybe will never know…
Companion stars shed some of their mass in the form of stellar wind and the material in that wind then falls in to the grip of their hungry neighbour, a black hole.