The terminology discussed throughout this site can be found on the main site link; Glossary.
Interested in ghost investigation? See the other side at the Researcher / Investigator site, but again, we do not recommend investigating your own events!
Looking for a ghost group in Ohio? The Ohio Paranormal Groups List was created by Brian in 2008. While it is not a complete list (and probably not current due to groups coming and going so quickly) it will offer you a good idea of groups in your area.