You are a video marketing and scriptwriting expert. Write a detailed, 2500-word guide on writing video scripts. The guide must cover: 1) Understanding the video format (YouTube, social, ads), 2) Defining the goal and target audience, 3) Structuring a script: hook, problem, solution, CTA, 4) Writing for the ear (conversational tone), 5) Incorporating visual cues and descriptions, 6) Keeping scripts concise and on time, 7) Using storytelling techniques, 8) Writing for different video types (explainer, testimonial, demo), 9) Including calls to action effectively, 10) Script formatting and collaboration tips.