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Can search engines reach your pages, and are the right ones indexed? Check robots directives, the sitemap, and whether anything important is blocked or marked noindex by accident.
This is where the catastrophic errors live. A noindex left on after a staging deploy removes a site from search entirely, and it is more common than it should be.
The same content on several URLs — with and without trailing slashes, with tracking parameters, across protocols — splits signals between them.
Canonical tags tell the engine which version counts. Getting these wrong, especially canonicals pointing at the wrong page, is a quiet and expensive failure.
No. It removes obstacles; it does not create demand for a page.
An accidental noindex or blocked crawl. Both can remove a site from search entirely.
On a schedule. Technical debt accumulates with every deploy and announces nothing.
Half an hour with your own data usually saves reading three of these. The guides will still be here afterwards.