Even after all these years, meta tags remain a mystery to many implementing organic SEO campaigns. Some SEM professionals say only the title tag matters, because that's all the search engines use. Others say keyword and description tags still matter.
Meta tags remain a fundamental part of any Web site. That's not because they're a silver bullet able to shoot an indexed listing to the top of results, but because they deliver behind-the-page relevancy for topics covered on the page.
Abide by the World Wide Web Consortium's
(WC3's) rules on HTML document structure, and your meta tags will be fine.