All of these sections are known as widgets and are accessible via Appearance > Widgets.

It will look like this:


This appears on a blog category screen.

Post Sidebar

This appears on a single individual article.

Header Advertising

This appears at the top next to the logo so long as Header Style 1 is selected. See more

Home Sidebar

This appears if you've chosen a homepage template which includes a sidebar.

Pages Sidebar

This appears on a page so long as 'Full width' is not selected via the Template dropdown.

Shop Sidebar

This appears if you have installed WooCommerce

First Footer

This is the main footer section.

Second Footer

This is used usually to just display copyright information.