Learn how to audit the SEO plugin configuration of an existing website.

Check:

• Is indexing enabled?
• Are important content types indexable?
• Are unnecessary archives indexed?
• Is the XML sitemap configured correctly?
• Are canonical URLs present?
• Are redirects configured correctly?
• Is schema enabled?
• Is more than one primary SEO plugin installed?

Also check:

WordPress → Settings → Reading → Discourage search engines from indexing this site

This setting can cause serious problems if accidentally enabled on a production website.