Generate a robots.txt file to control how search engines crawl your site.
Build a URL with UTM tracking parameters.
Check a website's SSL certificate details and expiration.
Check which security headers a website sends.
Generate hreflang tags for multi-language and multi-region SEO.
Count word and phrase frequency in a text and check one target keyword.
Fetch or paste a sitemap.xml and check it against the sitemaps.org rules.
Donaldson R F