Types of Spirits / Possible Hauntings

We usually encounter these ghosts:
a. family members and friends
If they didn't die a violent death, they are only attached to their former dwelling and try to bring
 attention of their family members or friends to themselves to get help. Mostly they appear to the person from whom the help is the most probable. They appear repeatedly in an urgent sense. Since they don't have negative karma, they aren't easily repelled by prayers etc. The duty of living persons

is to help them leave. Sometimes people know about the presence of their dead relatives and if they don't create problems to them, they get accustomed to them and consider them a sort of family protectors. Still their presence isn't proper and they should help them leave.
b. former apartment/house inhabitants or owners
They are attached to their former dwelling. If they moreover died a violent death, they bring attention to themselves so that someone helps them. If the help doesn't come for a long time, they are frustrated and may turn revengeful and harmful. They have a negative karma and thus can be repelled by prayers etc., but that's not a solution for them. It's necessary to help them leave. For that it's helpful to know their name. Like the previous ones, their activity often increases around Christmas.
c. traveling' ghosts
They don't bring attention to themselves and soon leave on their own. They're usually noticed by small children or pets, whom they may scare.
d. pets
Even dead pets sometimes have a problem to leave their family. It's practically the same case as "a".
We can also meet these two types who are actually not ghosts:
e. poltergeist
It manifests by kinetic and sound phenomena. It's a psychic energy usually related to a person in puberty with boiling emotions.
f. a demonic entity
If it's an aggresive entity and esp. sexual attacks, it's most probably a succubus or incubus. They attack usually younger people who live alone without a stable partner and their karma (drugs, magic, self-harming etc.) opened them to these influences. It can also be the entity sent by someone thru black magic.  In wilderness there're many other entities, some of whom can be dangerous (e.g. fen-fire or Wild Hunt).