Fortunately or unfortunately there are no major META tags that will help your site be ranked higher. Anybody that says so is trying to sell you something.
Several years ago there were two META tags whose expressed purpose was to help you describe your site.
<meta name="description" content="Place Description Here" />
<meta name="keywords" content="Place Keywords Here" />
Developers and SEOs (Search Engine Optimizers) quickly started to take advantage of the tags. One of the more eggregious ways that people took advantage of these tags was by putting highly ranked search terms in the tags even though those terms had nothing whatsoever to do with the site in question.
The logic behind this was that people would find and see the site even though it had nothing to do with what the people were searching for. This may or may not have been effective for the sites who were abusing the system but it annoyed people who were using the search engines. It also annoyed the decision makers at Google and other search engines. The result was that these two meta tags became deprecated: search engines no longer valued the information in these tags.
Once again, anybody who says there are meta-tags that will help your site be rated highly is -- at best -- many years out of date.
Is there anything you can do to get your site ranked higher? Yes, there are many things that can be done but none of them include META tags.
