The tags every page needs
Search engines read the <title> and meta description for your Google result. Social apps read Open Graph tags (og:title, og:description, og:image) for share previews, and X reads twitter:card. A canonical tag tells Google which address is the main one, and a robots tag can keep a page out of search results.
This generator writes them all from one short form, with the lengths measured in pixels the way Google cuts them.
How to add them
Paste the code inside the page's <head>, replacing any existing title and description tags. On WordPress, Shopify, Wix and other site builders, fill the same values into the SEO settings or your SEO plugin instead, since they write these tags for you.