SEO audit and indexability
The first layer is technical access and indexability. Review:
- HTTP status codes;
- canonical tags;
- robots directives;
- XML sitemap;
- internal links;
- redirect chains;
- 404 pages;
- duplicate URL variants;
- mobile usability;
- Core Web Vitals;
- crawlable text and navigation;
- Search Console coverage/indexing reports.
A page cannot rank reliably if Google receives conflicting signals about whether or where it should be indexed.