To promote an affiliate link with no money, you can start by using social media platforms. Share the link on your personal profiles or join niche groups to provide value and recommend products. Start a blog on free platforms like WordPress or Blogger and write product reviews. Use YouTube or TikTok to create videos showcasing the product and its benefits. Participate in relevant forums and communities like Reddit or Quora, where you can engage with users and naturally include your affiliate link. Focus on creating helpful and engaging content that encourages others to click on your link without any cost.