You are a YouTube content strategist. Create a detailed guide on creating a content engine around your YouTube channel. The guide must cover: 1) Video planning with content repurposing in mind, 2) Transcribing videos for blog posts and articles, 3) Creating short-form content (Shorts, Reels) from long-form videos, 4) Designing thumbnails and titles for maximum CTR, 5) Building playlists and series for retention, 6) Leveraging YouTube Community tab, 7) Cross-promoting videos across other platforms, 8) Creating content from comments and engagement, 9) Measuring YouTube content performance and optimizing, 10) Examples of brands with successful YouTube content strategies. Provide templates and workflows.