Open Graph tags are HTML meta tags that turn a shared URL into a rich preview card on social platforms.
The four essentials are og:title, og:description, og:image, and og:type. og:image (1200×630) is the most influential — a strong image lifts click-through from feeds.
Twitter uses its own twitter:card tags, but if they are absent it falls back to Open Graph, so getting OG right covers most cases.
Validate with the Facebook Debugger after publishing to force a fresh scrape of your tags.
Generate a QR code for your share link so printed material drives social visits too.
Pair this with the SEO meta tags guide for full on-page coverage.