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- Hidden Links via Positioning/Color, for Design/Accessibility: This method can bring you “dangerously close to a grey area.” Don’t use this method.
- Hidden Links with No Mention of Accessibility or User Value: These links are only intended for bots to see as attempt to deceive search engines. [Meaning it’s going to get you banned or in big trouble with Google]
This is a basic take-away, Barry’s post goes more in-depth.