Category on Spirits?

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As far as I know, there are 2 categories for spirits or ghost: one is the Human Spirits. They are the spirits of dead human beings. It has been known that they are the most common spirits seen by humans. The second one is the Dark Entities. They are associated by many as shadows in the cemeteries. They are believed to have the ability to harm humans and are able to move things. How about you, what do you know?