Components are reusable blocks of HTML code. It could be placed on category pages or inside posts
Administration of Components is in left navigation in redaction, see Components in WordPress backend.
Page Builder
Components are usually built using page builder widgets (but can be created using the visual editor as well)
Bringing components together
You can group several page builder widgets into one component
Using components
Once you have created a set of components, you can use them to be included in articles or pages or even some categories
The following demonstrates how to insert the both components we created before
