5 types of ghosts that you may not know of:

1. Poltergeist

   • A Poltergeist is known for being agressive and misunderstood.
     As said in a different article, "originates from a German word which mean "noisy ghost". This type of ghost is most often used in horror films, such "Poltergeist", "Paranormal Activity" and "The Changeling". They are given the name due to the fact they can interact with the environment, and move and throw things. They are mostly negative, and try to harm and scare people. Often by opening and shutting doors, windows, cabinets, turning lights on and off, starting fires and throwing things."

2. The Yūrei (幽霊)

   • The Yūrei (幽霊) is a vengeful Japanese spirit that is told in many folklore stories.
     An article known at Yokai.com has the information of what an interation with a Yūrei's purpose or goal.

3. Orbs of Light

   • These Orbs of Light are commonly seen and completly unharmful. They are often found on camera in small balls of light that could be white or blue.

4. Doppelganger

   • Source https://www.britannica.com
   
   
   • Although a dopplegänger is more of a spiritual being, it can take the matter of a ghost/spirit. This strange being can transform into any appearances and lure in anything it wishes. If you are to encounter a doppelgänger, then it is a sign of an omen and bad luck.

5. Intelligent/Interactive Ghosts
   • Source mysteryhat4u.blog
   • These spirits have the energy and intelligence to be able to make physical contact with a human being. Many ghost hunting videos include them doing séances and communicating functionally with the spirit. Many tools such as spirit boxes, rem pods, and even a simple object that the ghost can channel its power through to communicate.