Act as an experienced SEO consultant with 10+ years of expertise in optimizing websites for search engines. Write a detailed guide explaining the purpose and impact of canonical tags on SEO performance. Include examples of how canonical tags can prevent [duplicate content issues], improve [crawl efficiency], and enhance [ranking potential] for specific pages. Discuss best practices for implementing canonical tags in [dynamic websites] and e-commerce platforms. Address common misconceptions and errors related to canonical tags, and provide actionable tips for auditing and fixing improper canonical tag usage. Tailor the guide for an audience of [mid-level SEO professionals] who are familiar with technical SEO concepts.