<meta name="robots" content="none"> - will search engine index this page? & <meta name="robots" content="index"> - any difference from the 1st code & <meta name="robots" content="index,follow"> - any difference from the 1st & 2nd code Not sure about these 3 code, anyone have clear idea?
<meta name="robots" content="none"> is equal to "noindex" "nofollow" <meta name="robots" content="index"> will index the page in SE's listing. <meta name="robots" content="index,follow"> Bots will index it and will follow links of this page I think!