As I don't know the story yet, I can't tell the key elements. But generally, key elements in a story could be the main character's goals, the challenges they face, and the outcomes of their actions.
I'm not sure which specific 'Jeff Alm' story you're referring to. There could be many people named Jeff Alm. More context would be helpful to accurately tell the story.
Definitely real. Jeff Dahmer's horrific acts and his story have been extensively covered in the news and various true crime accounts. There's a lot of evidence and testimony to confirm it.
Jeff the Killer is purely fictional. It was created and spread through various online platforms and has no basis in real events. People just came up with the creepy tale for entertainment or to scare others.
Definitely real. Jeff Dahmer committed heinous crimes that were well-documented and widely reported. His case is a disturbing part of true crime history.