Types of stars are White Dwarf, Main Sequense, Gigants and Super Giant.
Nuclear Fusion is when two hydrogens get together and make heat and energy.
The Life Cyclo of a Star: it start with the stellar nebula and in the stellar nebula start a process called nuclear fusion that is when two hydrogen get together and it form a baby star and than it turn into a red giant or red super giant and than it turn into a planetary nebula or supernova and than it turn into a White Dwarf, neutron star or a black hole.