Ineed i'm over thinking !

what are some general effects a first-person point or view creates in a story?

Man I started to over think it too... but  to put it in simple terms basically it gives the reader like some background knowledge of the character sort of by including their thoughts and how they look at different situations . I hope that helped rather than confused u even more lolz

Unlike a third person story, a story in first person allows you to understand what the character is feeling and only what the main character is feeling. You won't learn what the guy across the street really feels. If the story is in Bob's point of view, you will understand what Bob feels, what he sees, and how he thinks. You will not understand how Sally down the street feels. Sure, maybe Bob will learn a little about Sally, but if Sally says something, Bon will interpret what she just said in his own way. I could be wrong but that's my opinion.

Dr. jekyll he told it cause it happened to him