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Professional Coder here is a short list of important meta tags for 2020
Title tag
Meta description
Canonical Tag
Alternative text (Alt) Tag
Robots meta tag
Social Media Meta Tags (Open Graph and Twitter Cards)
Responsive Design Meta Tag
As to meta keywords however is one of the least used as many have abused them year after year. Once upon a time 3 to 5 were okay but...
As to case-sensitive no... it is about key word density and as to word structuring.
Please note however this question is offtopic for the community question and answer section. If you would like further discussion on SEO please feel free to DM or post this in your activity feed.
Thanks and happy coding.
https://www.sololearn.com/discuss/1316935/?ref=app
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