In the left column, you will see tabs with which settings can be adjusted or changed. Such as: adding new pages, modifying comments, etc. By selecting one of the tabs, you will see the available options. Click the arrow at the bottom right of the menu to hide the menu.

Main menu options

• Dashboard:
  Under the home tab you will see, depending on the set screen options (top right), which WordPress and Theme version you are using, an overview of the number of Posts, Pages, and comments and information from a number of plugins you use, such as Google Analytics. The tab below indicates the number of available updates.
• Posts:
  View and/or maintain your messages here, create a new message and manage your categories and/or tags.
• Media:
  Here you will find all media files, such as photos, movies, documents and music. You can also add files here.
• Pages:
  View, maintain or create new pages.
• Comments:
  Manage visitor comments
• Appearance:
  Changing the Theme, adjustments, and/or adding widgets, menus, and sidebars. The customized options depend on the theme you are using. With the edit option, you can make adjustments in the theme. My advice is to stay away from that especially if you don't know exactly what you're doing and always make a backup before doing anything.
• Plugins:
  Add, remove, activate and deactivate. With plugins, you can extend the standard features of WordPress.
• Users:
  The users of your site with job descriptions. You can choose between Administrator, Editor, Author, Writer, and Subscriber. If you have a webshop, you can also choose Customer and Store Manager.
• Tools:
  Tools for, for example, importing or exporting data
• Settings:
  Adjust page URL, set your homepage, privacy, and news page or adjust settings, and indicate whether or not you allow comments. Usually, you don't need to change these settings once you've done that.