Rankings of cultivation -
Star realm- beginner
Moon realm- Experienced beginner
King realm- Martial warrior
Emperor realm- Martial master
Sovereign Realm- Supreme Being
Transcendent realm- Heavenly Being
Godhood- Divine being
Realms-
Human Realms- where humans, elf's, dwarves, dark elves, and vampires reside
Pretas Realm- Where ghosts reside
Beasts Realm- Where mythical creatures reside
Asuras Realm- Where the lower demons reside
Demi Realms- Where the Demi gods reside
Heaven Realm- Where the dieties reside
Nether Realm- Where the 7 demon gods reside along with the lower devils
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Humans use cultivation to reach the peak while other beings are naturally born with powers, but that doesn't make them higher or lower, since you can also become a god by cultivation and by power.
A person can chose whether to take the demon path to become a demon lord or to take the diety path to become a pure diety.
A person can't descend from a realm once they ascended since it's a rule which both the demon gods and the diety's agreed on. You can only descend when you've reached the highest realm which is either the heaven realm or the nether realm, or if you've gained permission from one party being the heavens or the nether realm gods.