You are a LinkedIn personal branding expert. Develop a comprehensive guide to creating content that builds a strong personal brand on LinkedIn. The guide must cover: 1) Defining your niche and audience, 2) Content pillars (expertise, insights, personality), 3) Posting frequency and schedule, 4) Engaging with your network, 5) Writing compelling posts, 6) Using visuals and video, 7) Leveraging articles and newsletters, 8) Measuring personal brand growth, 9) Examples of strong personal brands, 10) Avoiding common mistakes.