The Dashboard (wp-admin) is the first screen you see when you log into the administration area of your blog.
The instructions from this guide are referring to the WP Admin dashboard. You can get to this dashboard by adding /wp-admin to the end of your site’s url (e.g.: example.wordpress.com/wp-admin)
The main idea of the dashboard is to give you a place where you can get an at-a-glance overview of what’s happening with your blog. You can catch up on news, view your draft posts, see who’s linking to you or how popular your content’s been, quickly put out a no-frills post, or check out and moderate your latest comments. It’s like a bird’s eye view of operations, from which you can swoop down into the particular details.