• Nowadays, Meta keywords are pretty much ignored by search engines (solved by google), but if you still use them, make sure it’s specifically enclosed to that page and formatted correctly.
• It should be unique, and no duplication as it will not get you anywhere
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Sources:
https://searchenginewatch.com/sew/how-to/2259693/seo-basics-8-essentials-when-optimizing-your-site