Act as an experienced SEO content strategist with 5+ years of expertise in optimizing content for search engines. Write a detailed 800-word article explaining the importance of content credibility in SEO, covering the following key points: [TOPIC 1: How Google's E-A-T (Expertise, Authoritativeness, Trustworthiness) framework impacts rankings], [TOPIC 2: Best practices for establishing credibility through citations, backlinks, and author bios], and [TOPIC 3: Case studies of websites that improved rankings by enhancing content credibility]. Use a persuasive tone, include data-driven insights, and provide actionable tips for [TARGET AUDIENCE: small business owners] to implement immediately.