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The Stellar Nebula is a giant cloud of gas that will someday become a newborn star, these clouds are massive, you can refer them to the star nursery because this may help you remember these a bit more.

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We refer to these as a Protostar and they are usually what we call the first glow of the newborn star after it is born from the Star Nebula.

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These stars are way more massive than a main sequence star, unlike main sequence stars who usually live longer, massive stars have a very short life span that is shorter than the main sequence star life span. (Main Sequence stars like our sun for example, usually live up to 10 billion years. Massive stars usually have shorter life spans.)

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Red super-giants are formed when a massive star is going to die and has ran out of gasses to use, it'll expand and use the remaining gasses it has as a red super-giant.

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A supernova is whenever a massive star has turned into a red super-giant and explodes, these novas are very large and powerful.

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These type of stars are usually formed after a supernova has occurred, it is the collapsed core of a massive super-giant star.

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A black hole was originally just a theory that Albert Einstein, he theorized that black holes exist in 1916, then in 1971, the first black hole was found, its name is Cygnus X-1. Black holes usually form from the remnants of a dead massive star that exploded into a supernovas, black holes are believed to evaporate in 1e+100 years. Which is a very long time.