Star is a giant ball of hot gases. It is made of gases.
There are four types of stars, White Dwarfs, Main Sequence, Giants and Super Giants.
H-R diagram is a chart that scientists use to classify stars by their types, sizes and temperatures.
Stars have different characteristics; they have different color, temperature, luminosity and size.
Nuclear fusion is two hydrogen molecules become together to a helium molecule, this is how stars make energy.
Stars are born in stellar nebula, and then become three types of star, sun-like stars, huge stars and giant stars. Sun-like stars go through red giants, planetary nebula, white dwarf, and finally become black dwarf. Huge stars go through red super giants, supernova and become neutron. Giant stars go through red super giant, supernova, and become black hole.
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