What length should the title be?

Aim for under 60-70 characters. Google truncates titles around 60 characters in search results. The tool caps title input at 70.

What length should the description be?

Aim for 140-160 characters. Google typically shows around 155-160 characters in SERPs on desktop, less on mobile.

Yes, ideally. Open Graph (og:*) is used by Facebook, LinkedIn, Slack, Discord. Twitter uses twitter:* tags with og:* as fallback.

1200×630 pixels is the recommended standard for Facebook, Twitter, LinkedIn. Under 8 MB, PNG or JPEG.

Strongly recommended. It tells search engines which URL is the "real" one when duplicates exist across parameters, locales, or trailing slashes.

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What length should the title be?: Aim for under 60-70 characters. Google truncates titles around 60 characters in search results. The tool caps title input at 70.
What length should the description be?: Aim for 140-160 characters. Google typically shows around 155-160 characters in SERPs on desktop, less on mobile.
Do I need both Open Graph and Twitter cards?: Yes, ideally. Open Graph (og:*) is used by Facebook, LinkedIn, Slack, Discord. Twitter uses twitter:* tags with og:* as fallback.
What size should the og:image be?: 1200×630 pixels is the recommended standard for Facebook, Twitter, LinkedIn. Under 8 MB, PNG or JPEG.
Do I need the canonical tag?: Strongly recommended. It tells search engines which URL is the "real" one when duplicates exist across parameters, locales, or trailing slashes.