SEO, Metatags
The metatags are to the right at the top of the page when you edit. It seems many of the items are no longer used by search engines. The node title and page title are automatically shown. You can check this by hovering over the tab in the browser.
For SEO, the two items we have to worry about are page titles and descriptions. As stated, the page title is automatically generated, so we would only have to change this if we decide to use a different system for naming. But what we have to worry about is the description. At the moment, Google is prioritizing SEO on these two items, but also just as important is that the description will be listed as a summary for the page on Google search.
If you look at all the Meta-tag options you will see that previously important SEO Indicators, such as keywords, have been demoted in importance.