Checking a website's SEO involves conducting a comprehensive audit across technical, on-page, and off-page factors. Start with free tools like Google Search Console and Google Analytics to identify indexing issues, traffic patterns, and user behaviour. Use SEO audit tools such as Screaming Frog, Ahrefs, or SEMrush to analyse technical elements like site speed, mobile-friendliness, broken links, and crawl errors. Evaluate on-page elements including title tags, meta descriptions, header structure, and content quality. Assess your backlink profile for quality and relevance, then check your local SEO elements if applicable. Regular audits help identify issues before they impact rankings and reveal opportunities for improvement.