I don't know if this is correct, but I think:
Normal and Polar Stars turn into Red Giants after some time.
Red Giants turn into either Supernovae or Nebulas, depending on their mass.
A Supernova can turn into either a Neutron Star, or a Black Hole
Normal Stars use hydrogen as fuel and are extremely hot.
Polar Stars are colder than Normal Stars but do the same thing.
Red Giants form when Normal or Polar starsrun out of fuel.
A Supernova is the explosion after a red giant callapses in on itself.
A Nebula forms from the gases of a supernova.
A Black Hole forms when a anything collapses and there's too much mass in one place.
a Neutron Star also forms when the supernova collapses on iself, but if there isn't enough mass to make a black hole, but enough space to collapse