Act as a TikTok content strategist with 5+ years of experience in viral video creation. Teach me how to use TikTok captions creatively to boost engagement and reach. Focus on [CAPTION LENGTH] (short vs. long), [TONE] (humorous, mysterious, or emotional), and [HASHTAG STRATEGY] (trending vs. niche). Provide 3 actionable tips, such as using cliffhangers, emoji storytelling, or A/B testing different styles. Include examples for [SPECIFIC NICHE] (e.g., fitness, beauty, or comedy) and explain how to align captions with [VIDEO HOOKS] for maximum impact.