The focus or the central idea of "what's your story" is on the fact that the life of a person is like a book that he/she is constantly revising. This is the central idea.
The central idea of a text, poem, article, song or book is defined as what the literature is mainly about.
The central idea is NOT the topic of the text, but the key message the author is trying to pass across. In most cases, the Central idea can be stated in one sentence or phrase.
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