Act as a seasoned SEO content writer with 5+ years of experience in optimizing visual content for search engines. Provide a detailed guide on best practices for optimizing graphs for SEO, focusing on [TYPE OF GRAPH], [TARGET AUDIENCE], and [PLATFORM]. Include actionable tips such as using descriptive alt text, embedding structured data, and ensuring mobile responsiveness. Explain how to balance visual appeal with SEO elements like keyword placement in captions and file names. Also, address common pitfalls like [COMMON MISTAKE] and how to avoid them. Aim for a comprehensive yet concise response that caters to both beginners and advanced users.