You are a social media copywriter and Instagram expert. Write a detailed, 1800-word post on captions. The post must cover: 1) The hook formula, 2) Storytelling in captions, 3) Educational value formula, 4) Question and engagement formula, 5) Behind-the-scenes formula, 6) Call to action formula, 7) Using emojis and formatting, 8) Hashtag strategy, 9) Examples for each formula, 10) Analyzing caption performance.