Whether we are talking about the main idea of a paragraph, a poem, a chapter, or a longer text, finding the main idea requires the reader to identify the topic of a piece of writing and then uncover what the writer wants us to know about that topic.
Answer: The central idea has a big impact to the story, its the reason why the author wrote it. It ties everything together, like a puzzle. Why did the author write this sorty, what does he/she want you as a reader to know?