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A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases.

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A protostar is a cloud of dust and gas (mainly hydrogen mixed with some heavier gasses) that has the mass of a star. It becomes an actual star once it reaches a high enough temperature to fuse hydrogen.

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Smaller sequence stars cannot reach Main Sequence, but 90% of stars including our sun are Main sequence. Main sequence makes up the majority of most star's lives
A bunch of gas and dust including hydrogen that causes nuclear fusion.After the nuclear fusion, the cloud begins to glow brightly, contracts a little, and becomes stable. It keeps shining for millions to billions of years to come

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A red giant is a very large star with high luminosity. It's a star that fuses hydrogen and helium and then it collapses because the lack of hydrogen energy. Then the star begins to compress due to it's gravity and causes to expand to a huge red star.

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A planetary nebula is a star that has collapsed because it has used all its fuel and has become unstable

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A white dwarf is collapsed star with very high density and gravity. They are mostly made up of Carbon and Oxygen. These stars sometimes steal matter from nearby stars because of the high gravity. If it keeps gaining matter, it could possibly go supernova.

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When only iron is left in the core of the star, fusion ceases and gravity collapses the star, releasing a shockwave. Iron is involved and heavy metals are formed.