In this section we'll create a custom widget for our theme. We have the showcase area on our web page and we will create a widget that can take in a title and some text, and will spit it out right in the widget position.
If we look at the documentation page at https://codex.wordpress.org/Widgets_API for the Widgets API, what we need to do basically is create a class that extends WP_Widget, and it's going to have a few different methods. It'll have a constructor to call the constructor of the parent class and also set up the title and description, the widget method that will output the content of the widget, the form method that will output the admin form, and update that will take care of updating any fields.
We'll go into the wp-content | plugins folder and create a new folder there, showcase-widget (although it is a plugin...