Black Hole (Celestial)
Black holes can exist in solar systems in place of normal stars. Black holes have strong gravity and should be avoided with any non-gravity based propulsion crafts, such as space rockets and rocket drive spacecraft.
Wormholes
Black holes cannot have any wormholes, if a black hole is the main sequence in the solar system, the interstellar wormhole will be around a companion star instead.
Unlike supermassive black holes there are no intergalactic wormholes around a normal black hole.