One of the most useful tools for WordPress is the Meta Tags Inserter. This allows Google, Bing and other entities to have tracking for site traffic reports and advertising CPM rates etc. Some SEO hustlers consider this tool to be one of the core assets. The tool is GLU licensed making it perfect for WordPress users.
Many of the tags in Meta Tags Inserter are now obsolete. There is a large custom box for other code and headers.
Meta Tags Inserter places the headers at the top of the HTML document to allow quick assessment for changes.
WordPress handles open graph headers for images natively.