Using WordPress Meta Boxes to Build a Basic SEO Plugin

One of the core feature provided by WordPress in extending its functionality is its Meta Box API. These meta boxes enable you to easily add additional data to your content. For example, the Post Tags meta box enables you set tags for your post. In this article, we will build a basic SEO plugin that adds a meta description, and an Open Graph title and description tag to the head element of WordPress pages. In doing this, we'll also learn how to create a custom meta boxes, how to sanitize user-provided data, how to save the data to a post or page, and how to and retrieve the saved data.

An additional assignment to learn more about this process: Extend this plugin and add a meta keyword field to the meta box form and also include it among the tags that are inserted into WordPress header.