What is a widget?
WordPress widgets are plugins used within sidebars.
Why do you need to know?
Widgets either present data in a way that is visually pleasing or provide the functionality to your WordPress website. There are as many different types of widgets as there are people to think them up.
Some (related posts for example) provide you an SEO benefit. Some websites display related posts in a sidebar. This is done using a widget.
Please do not get carried away.
This article is part of a series about local SEO marketing. For access to all the articles in the series, click on the link in the prior sentence.
Less is more. If your web visitors have to scroll down to see all your widgets, you have too many.
How do you use them?
There is a whole subsection of the dashboard devoted to managing widgets.
When logged into your dashboard, select Appearance -> Widgets, then take your time to understand what you are looking at.
Where do you use widgets?
This depends on the theme you are using. Some themes allow widgets in the sidebar, others allow widgets in headers and footers, and even after individual posts.
Just remember this rule for business websites: If your web visitors have to scroll to see them all, you are using too many.