From Customizer section, go to Widgets.
Primary Sidebar: This Primary sidebar is default sidebar. This sidebar is dispaly at blog page, single blog pages, archive pages.
Widgets are one of the most important aspects of this theme. Four special widgets are specially built for the front page so that most of your content can be categorized easily and be accommodated to feature in the front page.
- Footer Widgets: These widgets are used in footer section.