They can give you positive, constructive criticism from their own perspectives. They can help you format better, elaborate in certain respects, give an outside opinion, or spot any grammatical errors you may have missed.
Answer: They can read over your paper and tell you what to change and what to keep!
Explanation: Like a peer review, a friend, family member, or anyone you know can help you edit a story in many ways! They can read over your story and note any mistakes such as:
Grammar mistakes
Mispelled words
Weak words
Wrongly used words or phrases
But, make sure to keep it positive if you're doing a peer review!