Canonical Link to the Original Source for Republished Posts
Points the canonical tag of a post to the URL in its "original_url" custom field, for articles first published elsewhere, so the original keeps the search credit.
Snippet Library
SEO snippets for WordPress
Snippets for search engine basics: meta descriptions, Open Graph tags, structured data, noindex rules and robots.txt changes. Lightweight options for sites that do not run a full SEO plugin, or need one specific fix.
Canonical URLs on Archive Pages
Adds canonical link tags to the blog page, category, tag, author and post type archives, which WordPress only does for single posts and pages by default.