You are an email marketing technology and personalization expert. Write a detailed, 2400-word guide on dynamic content. The guide must cover: 1) What is dynamic content and how it works, 2) Types of dynamic content (product recommendations, location-based, behavioral), 3) Setting up dynamic content in email platforms, 4) Segmentation and rules, 5) Personalization tokens and variables, 6) A/B testing dynamic content, 7) Use cases for dynamic content, 8) Examples of dynamic emails, 9) Tools and platforms, 10) Measuring performance and lift.