1. Get familiar with the interface
The Administration Screen provides access to the control features of your WordPress installation. Each Administration Screen is presented in sections, the toolbar (and header), the main navigation, the work area, and the footer.
Toolbar has links to various administration functions, and is displayed at the top of each Administration Screen. Many Toolbar items expand (flyout) when hovered over to display more information.
Main Navigation menu details each of the administrative functions you can perform. At the bottom of that section is a Collapse menu button that shrinks the menu into a set of icons, or to expands to list them by major function. Within each major function, such as Posts, the sub-menu expands (fly-out) when hovered over, and expands fully if an item clicked.
In the work area, the specific information relating to a particular navigation choice, such as adding a new post, is presented and collected.
Footer, at the bottom of each Administration Screen in light shading, are links to WordPress, thanking you for using it, and the version of WordPress you have installed is shown.
Overview of WordPress
WordPress is a free and open source content management system (CMS) based on PHP and MySQL. It is the most widely used CMS software in the world, and as of May 2019, it powers more than 30% of the top 10 million websites and has an estimated 60% market share of all websites built using a CMS.
WordPress started as a simple blogging system in 2003, but it has evolved into a full CMS with thousands of plugins, widgets, and themes. It is licensed under the General Public License (GPLv2 or later).