How Do Meta Tags Help SEO?

To rank high in Google in 2017 has more to do with relevance and reputation of high-quality content, user satisfaction and popularity than meta tag optimization.

In my experience, Meta tags do not noticeably influence where a page ranks in Google, in a positive way.

Of course, meta tags, when used properly can still be useful in a number of areas outside just ranking pages. Abuse them, and you might fall foul of Google’s punitive quality algorithms.

Google may use metadata, amongst many other signals, to CLASSIFY pages, or DISPLAY information about a page in SERPs.

Google Uses Meta Tags For Ranking Pages?

Some search engines use to  look at  hidden HTML tags to order pages in search engine results pages, but most all search engines (in 2017) have evolved past this, and Google certainly has.

Google is on record as saying it does not use some data in meta when ranking a page (in a positive way) and tests throughout the years have certainly seemed to confirm this.

Meta tags are a great way for Webmasters to provide search engines with information about their sites. (They) can be used to provide information to all sorts of clients, and each system processes only the meta tags they understand and ignores the rest. (They) are added to the <head> section of your HTML page.

Google may use metadata, amongst many other signals, to CLASSIFY pages, or DISPLAY information about a page in SERPs, although, when used at all, being used mainly for DISPLAY purposes…….Google

https://www.mseo.com/meta-tags/