This page helps centralize the various tests you might carry out while testing out the SEO analysis of a Website. Validator Link

Facebook Debugger

Rich Results Testing Tool

Rank Math SEO Analysis tool check redirection status of all versions of site/page

Check Robots.txt

Check Sitemap

Check index/noindex

Check canonicals

Check Backlinks

Check if the following paths are being blocked by firewall (WordFence/security plugins, Hosting, CDN/cloudflare)