Stars come in 4 main types - forming stars, main-sequence stars, giant stars, and dead stars. Forming stars are stars that just formed from a nebula or a gas cloud. Main-sequence stars are normal, shining stars. Giant stars are stars that are near the end of their lifespan and has its size and luminosity greatly increased while losing mass. A dead star is a star that has ended its lifespan - there are white dwarfs and neutron stars. Stellar black holes are also remnants of dead stars, but aren't stars.