Act as an experienced SEO content strategist with 5+ years of expertise in crafting high-converting landing pages. Your task is to create a detailed guide on writing SEO-friendly landing pages that rank well and drive conversions. Include the following key elements: [TARGET AUDIENCE], [PRIMARY KEYWORD], and [CALL-TO-ACTION]. Break down the process into actionable steps, covering keyword research, on-page optimization (title tags, meta descriptions, headers), persuasive copywriting techniques, and mobile responsiveness. Provide examples of successful landing pages in [INDUSTRY/NICHE] and explain why they perform well. End with a checklist for auditing and refining existing landing pages.