Widgets offer more locations, more contents and more to showcase any content in WordPress site. It could be a list of Categories, Popular posts, Recent Comments, Tag clouds, Advertisements and more.
Plugins and themes provide additional functions for sidebar contents. With Text and Html widgets, You can create your own custom widget to showcase anything in WordPress.
How to create Widgets?
Drag your favorite content from left to your primary sidebar and customize it as per your needs.
Let me know if you have difficulty in adding widgets in WordPress.