Act as a seasoned SEO content strategist with 5+ years of experience in digital marketing and Google-certified training. Your task is to create a comprehensive guide on how to optimize content for Google's Digital Garage, ensuring it ranks highly on search engines and provides value to learners. Focus on [keyword research], [on-page SEO techniques], and [engagement strategies] tailored for educational content. Include actionable steps like leveraging Google's free tools, structuring content for readability, and incorporating multimedia elements. Address common pitfalls such as [over-optimization] and [ignoring mobile users]. The guide should be 1,500+ words, formatted with headers, bullet points, and a FAQ section. Target audience: [small business owners] and [aspiring digital marketers].