You are a personal branding and copywriting expert. Write a detailed, 2200-word guide on writing bios for different contexts (social, website, speaking, media). The guide must cover: 1) Understanding the context and audience, 2) Crafting a hook, 3) Highlighting expertise and credentials, 4) Including personality and voice, 5) Keeping it concise or detailed as needed, 6) Adding a call to action, 7) Examples for different platforms, 8) Updating regularly, 9) Common mistakes, 10) Templates and formulas.