
1) Residual Haunting: this is a fairly common type of haunting. It is best described as a manifestation of an entity going about some kind of task that gets replayed over and over again. It is often linked to a specific location where an event occurred. The haunting might be as simple as just seeing someone walk up the stairs and then disappear. The entity will not acknowledge the presence of any of the living around it. These are common around old buildings, and the entity may continue with the recurrent activity long after the location has been altered. One example of this is seeing a spirit walk down a hall and then turn to disappear directly into a wall. Upon investigating the history of the location, you may find that the area had been remodeled and there might have been a door there at one time.
2) Intelligent Haunting: another kind of haunting, and one that many paranormal shows try to capitalize on. This type of haunt is characterized by very specific and intelligent interaction between an entity and the living. Spirit voices caught on tape or the feeling of being shoved when walking down an empty hallway are some examples. As an investigator, you can distinguish this from a residual by simply asking questions, but provide the spirit a way to answer. Ask for a knock or a flash of a light on a K2 meter or your own flashlight. Always keep a digital voice recorder ready for these interactions, because some of them won't be discovered until you research your evidence at a later date.
3) Poltergeist: literally translated as "noisy ghost", this type of haunting is characterized by frequent, and sometimes violent, displacement of objects. There is often no physical entity seen and no intelligent interaction that occurs. This is the only haunting listed here where there has been plenty of scientific research to indicate that it may be caused by physical energy manifested by the living. It is not unusual to link this kind of activity to a home that has had some form of psychological upheaval (ie physical/sexual/mental abuse, one or more of the inhabitants entering puberty, high stress environments). There is still a lot of research that needs to be done on this kind of haunting.

As with any haunted location, as an investigator, I always prepare myself ahead of time. Get a detailed description of the events that have happened, have the right equipment handy, and rely heavily on my religious beliefs to protect myself prior to entering any of these places. And that is why these things don't scare me. I'm afraid of heights and ticks, but not ghosts.
BTW: get your copy of Angel Blade here! The fight between Heaven and Hell, and saving the world from demons. http://christophermatthewspub.com/angel-blade/
Thanks for reading!
And, as always,
Who you gonna call?