What are the differences and connections between demons, ghosts, immortals, buddhas and spirits?

Demon: generally refers to monster beast or demon xiu. Originally living animals and plants, open up spiritual wisdom, inherit talents from memory, absorb the spiritual strength of heaven and earth, turn physical strength into demon power, open the road of cultivation, and have the opportunity to become human beings. Any demon is bound to devour the essence of human beings (monks or practitioners), greatly increase their strength and reach the advanced level of blood. (such as insect demon, fox demon, snake demon, tree demon)

Essence: All animals and plants, such as wild animals or plants, open up spiritual wisdom for a long time, never devour the essence of human beings or animals, but only absorb the aura of heaven and earth, thus ensuring the source of purity. (such as willow essence, peach essence, ginseng essence, clam essence)

Demons: Most of them are aliens from outer space, bloodthirsty and bellicose, with different kinds, including humans, animals and aliens. They all strengthen their physique by absorbing evil spirits or devouring the blood of other races, so as to achieve advanced ability. (e.g. ancient demons, hunger, demons)

Ghost: refers to an alternative life form in which the human soul leaves the body and does not enter reincarnation, and gradually produces spiritual wisdom when wandering in the world. (such as eating goods, hungry ghosts, etc. )

Weird: Generally speaking, a substance that has no life characteristics is gradually transformed into a monster with life breath and intelligence under the attack and nourishment of the essence of the sun and the moon. (such as stone monsters, water monsters, mountain monsters, etc. )

Spirit: a living body with spiritual wisdom born from the fusion of the essence of heaven, earth and five elements. (such as fire spirit, water spirit, earth spirit, wood spirit, etc. ).

Fairy: A human monk. After practicing, Du Jie ascended to heaven and lived forever with heaven and earth.

God: After the immortal gained the rank of fairy spot through hard work, he gained the status of god, that is, he is a god.