Act as a seasoned digital marketing strategist with 5+ years of experience in Google Ads optimization. Your task is to create a comprehensive guide on how to optimize Google Shopping Ads for better performance and ROI. Cover key aspects such as [PRODUCT DATA FEED OPTIMIZATION], [BIDDING STRATEGIES], and [AUDIENCE TARGETING]. Provide actionable tips, best practices, and common pitfalls to avoid. Include real-world examples and case studies where applicable. Ensure the content is SEO-friendly with relevant keywords like 'Google Shopping Ads optimization' and 'maximizing ROI.' The guide should be detailed, easy to follow, and tailored for [E-COMMERCE BUSINESSES] looking to scale their ad performance.