Yoast SEO

Yoast SEO is one of the most installed WordPress plugins. It adds fields for SEO titles and meta descriptions to each post, generates XML sitemaps, outputs structured data about the site and its pages, and handles canonical tags and other technical settings that WordPress does not cover on its own.

Editors know it for the analysis box under the post editor, which checks a focus keyphrase and gives readability feedback such as sentence length and passive voice. The free plugin covers most needs; the premium version adds redirects, internal linking suggestions and support for several keyphrases.

Treat the color-coded checks as prompts. A green light means the page meets the plugin's rules, which is different from the page being good, and experienced writers often ignore checks that would make the text worse.