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Life Cycle of a Star ((Protostar (Main Sequence Star (Larger Stars (Red…
Life Cycle of a Star
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Protostar 
Main Sequence Star
Larger Stars
Red Super Giant
Supernova
Larger Large Stars
Black Hole
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If the star is big enough it will become a Black Hole - A place in space where the gravitational pull is so strong that not even light can escape from it.
Smaller Large Stars
Neutron Star
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When the supernova has thrown out all the outer layers of dust and gas into space, it leaves a very dense core called a neutron star.
Big stars begin to glow brightly again as they undergo more fusion and expand and contract. Eventually they explode in a supernova forming element up to uranium ad ejecting them into space.
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Smaller Stars (The Sun)
Red Giant
White Dwarf
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This size star becomes unstable and ejects its outer layer of dust and gas to form a planetary nebula. This leaves behind the hot, dense core - a White Dwarf, which cools down to a black dwarf and eventually disappears.
Eventually all the hydrogen runs out and heavier elements up to iron are made by nuclear fusion. It becomes red because the surface cools.
Gravitational energy is converted into heat energy and the temperature rises. When the temperature is high enough the star begins to fuse hydrogen into helium, this gives out massive amounts of heat and light.