You are a LinkedIn content strategist. Create a detailed guide to building a brand presence on LinkedIn. The strategy must cover: 1) LinkedIn goals: thought leadership, brand awareness, lead generation, networking, 2) Profile and company page optimization, 3) Content pillars and post types (articles, posts, documents, videos, polls), 4) Posting frequency and optimal timing, 5) Hashtag strategy and engagement tactics, 6) LinkedIn articles for long-form thought leadership, 7) Employee advocacy program, 8) LinkedIn Live and events, 9) Measuring LinkedIn performance: impressions, engagement, followers, leads, 10) Examples of successful LinkedIn content. Provide a content calendar and post templates.