What is the correct method for handling canonicalization issues when two or more product pages on a website have nearly identical content?
When two or more product pages have nearly identical content, the correct method for handling canonicalization issues is to select one page as the canonical version and implement canonical tags on the duplicate pages. Canonicalization is the process of telling search engines which version of a set of duplicate or near-duplicate pages is the preferred one for indexing. The canonical tag is an HTML tag placed in the <head> section of the duplicate pages that points to the canonical URL. For example, if '/product-a' is the preferred page, the duplicate pages should include: <link rel='canonical' href='https://www.example.com/product-a' />. It is important to ensure that the canonical URL is fully qualified (including https://) and that the canonical tag is implemented correctly. If the duplicate pages are paginated versions of the same product, use the rel='next' and rel='prev' attributes to indicate the relationship between the pages. Avoid using robots.txt to block duplicate pages, as this prevents Google from crawling them and discovering the canonical tags. Also avoid using 'noindex' on the duplicate pages without a canonical tag, as this may prevent the passing of link equity to the canonical page. Choose the canonical page based on factors such as which page has the most inbound links, the highest conversion rate, or the most comprehensive information. Regularly monitor crawl errors in Google Search Console to identify and fix any canonicalization issues.