Act as a seasoned e-commerce copywriter with 10+ years of experience crafting high-converting product descriptions for [INDUSTRY]. Your task is to provide a detailed, step-by-step guide on how to write compelling product descriptions that boost conversions for [TARGET AUDIENCE]. Include techniques like highlighting [UNIQUE SELLING POINTS], using persuasive language, and structuring the description for readability. Also, share common pitfalls to avoid and examples of before/after descriptions. Tailor your advice for [PLATFORM], whether it's Shopify, Amazon, or a custom website, and ensure the tips are actionable for both beginners and advanced marketers.