Act as a seasoned SEO content writer with 10+ years of experience in crafting high-converting product descriptions. Write a detailed guide on best practices for writing SEO-friendly product descriptions for [E-COMMERCE PLATFORMS] like Shopify, Amazon, or Etsy. Include strategies for incorporating [TARGET KEYWORDS] naturally, optimizing for readability, and highlighting unique selling points (USPs). Provide examples of how to use [SENSORY LANGUAGE] to engage potential buyers while maintaining SEO optimization. Additionally, address common pitfalls to avoid, such as keyword stuffing or overly technical language, and explain how to balance SEO with persuasive copywriting. Finally, suggest tools or techniques for testing and refining product descriptions to improve search rankings and conversions.