Stars are born, live, grow older and eventually die. However, stars live for millions of years and therefore change very slowly compared to humans. Stars are born together in groups from spinning gas and dust. Gradually the clouds condense, the temperature rises and star clusters form. When the energy runs out the star dies.
Black holes are probably the weirdest objects in space.
A black hole is a collapsed star. They are caused by supernova explosion. A black hole would have to be closer than one light year to have even a small effect on the orbits of our Solar System. The nearest black hole is 10,000 light years away from Earth. It is next to a giant blue star, and it may eat it.