I watched the movie last night and I didn’t understand why the ghosts are there and how did they get there and what did they want. And also what’s up with the kid Jona? What was he used for? Can someone please explain to me?

I watched the movie last night and I didn’t understand why the ghosts are there and how did they get there and what did they want. And also what’s up with the kid Jona? What was he used for? Can someone please explain to me?
i never was never a big believer in the paranormal. the only strange thing that ever happened to me was when me and 3 of my friends played with a ouija board i asked what was my grandfathers birth date and it spelled out 1943 and i knew that my friends didn’t know that -whats [...]
I’m sorry if you find this question strange or offensive. But I’m just trying to understand the reasoning behind believe in God and the supernatural.
And please don’t answer:
“Because the Bible says so.”
or
“the Holy Spirit is real and ghosts are not”
Those are claims without reason or proof.
What’s the best BOOK on parapsychology, physics or energy psychology you have ever read?
What would be a good camera for paranormal investigations that doesn’t cost a fortune?
I know they’re not exactly the same thing. I googled it but didn’t understand Wiki.
I mean like someone being a Spiritualist and someone being a Spiritist.
I don’t mean like being a “spiritual” person. .as in religious.
A psychic I went to years ago said “I’m a Spiritualist…not a Spiritist.”