in Google Meta tags like Keywords and Description dont affect your pages ranking and never have (and ive been doing seo since 1998 so i know)
meta description can help with clickthrough rates for your listing so best to put those in but i wouldnt bother with keywords
tags like refresh, nocache, noindex and others do help you control a users experience and/or how search engines perceive your website but again they dont have any influence on ranking.