When creating new items, you will be using an Editor with tools that makes adding content a little bit easier.
The Editor provides access to many of the features you may be used to using in Word, but for your website content.
For example, you can make some text bold, without having to know how to write
<strong>make some text bold</strong> and other html code.
Most of the Editor’s functions are accessed from the toolbar, which contains rows of buttons and lists that execute various commands on article content, like Bold or Underline or open a dialogue for actions like inserting images
For more detail on how to use the editor, visit the official page: