Are ghosts only spirits that are angry, evil, or lost?

Ghosts, spirits, or whatever word you would like to use, are all the same thing.

The point is that there are beings we cannot always see that are tangent to this world. Some of them are good and some of them are bad. They can affect our emotions, manipulate us when we are vulnerable, and empower us when we are strong. It is important to surround yourself with love and positive things and people. Angry or negative people are vexations and attract bad spirits.

People do not become ghosts but certain people may create a presence in our lives after they pass, usually in order to teach us something or to guard us. The idea of "haunting" is quite silly.

The most credible stories about ghosts are the ones where the ghosts repeat some action. This indicates that there is some kind of imprinting of objects in the area and the ghost replays a pattern in a way that is similar to a recording. Given this, it's unlikely that it's actually a part of a person's consciousness that survives after death.

Most typically, the person who "becomes" a ghost has lived or worked in the haunted area for a long time.

So far there has been no objective proof despite the many attempts.

To try and answer your first question i would say I have seen more then I care to my first experience was when I was a small child and my mom was walking in to the Kitchen.. to make a long story short I saw this old lady standing where my mom should have been she ( the ghost ) bent down and smiled at me...the second time something like this happened I did not see anything but the walls inside the house where banging loud enough that we moved ( this only happened one night )..the sound was like a football player running into the wall from the outside..in the same house my father in laws mother ( this is before the banging happened that one night ) was stuck in the bathroom for three hours and we did not hear her asking for help but she said she was we thought she was crazy..also in the same house I was preparing a birthday party while every one was gone I heard what I thought was a couple of guest coming early with my father in law when I opened the door no one was there I am sure I heard him and a stranger right out side the door where I was fixing the balloons and stuff..I also went ghost hunting once by myself it was not a good idea but I did get to meet a ( ghost )man who made me scream out of fear I said at the top of my voice ...who are you ?? he approached me and asked me to leave I on the other hand wanted to stay I said you are not a ghost you are just some guy but I knew what he was so we came to a agreement and I left...promising never to return..that really happened I almost did not tell it because it still makes me feel funny ( scared ) but I can say he just wanted people to stop coming to that part of the pond and river maybe because people were just partying all the time.... I did some research on this and found out that a river if it has sand mounds or duns or a island in the middle of it...it attracts ghost I forget why this is at the present Moment but it has something to do with the separation of the flow of water he was ( the ghost ) not mean but was damn scary for me I was 25 years old at the time...also we found out later that two old people died in that house of a heart attack they were husband and wife.. they were painting the inside of the garage when the old man had a heart attack then the old lady had one next...those ghost in that house where strong...( I am speaking of my father in laws house here not the river ) I may be attracting them without my knowledge I may be some kind of psychic I have seen allot but I do not understand why or how it all works but I do read allot on the subject..sorry I am not able to answer you second question ..........

Ghosts could also be people Astral Projecting? Or the obvious explanations.