I have read your this of the information and according to my point of view Robots meta tag requires more attention. I refer to pages that do not want to be crawled and indexed. It is the state of the page (s) on your site with content that need to be there but you do not want to be indexed.
Meta tags are the tags used to describe the content i.e. on the page itself. Meta Description and Meta Keywords are the another meta tags which are used by the bots or by only specific search engine crawlers.
A Meta tag is basically an HTML tag, whose job is to provide data to search engines (SE) on the nature of the information contained on the website. This three attribute which play important role to increase a search engine ranking of your site.
1. Content
2. Name
3. Http Equiv
Linear Mode
