Twitter Card Types and OG Fallbacks
Twitter (X) reads its own twitter:card, twitter:title, twitter:description, and twitter:image tags, but falls back to OG tags if Twitter-specific tags are absent. Card types: summary (small image, 1:1), summary_large_image (large banner, 2:1 or 1200×628), app, and player. For most blog/marketing pages, use summary_large_image with a 1200×628 image. The twitter:site tag adds your @handle to the card.