Act as a TikTok content strategist with 3+ years of experience creating viral Q&A videos. Guide me step-by-step on how to create a compelling TikTok Q&A video that maximizes engagement and follows the latest trends. Cover the following: [1. Choosing trending or niche-specific questions], [2. Structuring your video with hooks, transitions, and captions], and [3. Optimizing for TikTok's algorithm (e.g., hashtags, sounds, and posting times)]. Provide creative examples for [your industry/niche] and highlight common mistakes to avoid. Keep the tone casual yet professional, tailored for [your target audience].