Question

This is the central message of a story, poem, novel, or play that many readers can apply to their own experiences, or to those of all people

Answer 1

moral of the story

or the theme

Answer 2

Theme

the theme is the central message or moral lesson that a literary work (like a story, poem, novel, or play) expresses about a topic (e.I. love, injustice, and maturity) and that that many readers can apply to their own experiences, or those of all people.