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Brandon Heng6,734 Points
How does Meta Tags impact SEO? Google says don't don't use Meta Tags at all, since it's so easily abused.
Meta tags are the documents meta data example
html <meta charset="UTF-8"> this is telling the browser that the document has a character set of UCS Transformation Format—8-bit (had to get that bit off wikipedia". Here is a link that explains this more in depth about meta tags and robots.txt,
hope this has been of some use to you I am still learning.
Link: http://www.robotstxt.org/meta.html (for robots)
Link: https://support.google.com/webmasters/answer/79812?hl=en (for google meta tags)
Link http://www.bing.com/webmaster/help/getting-started-checklist-66a806de (bing getting started checklist)