What is a theme

A theme is a set of templates, modules, global content, and style settings that can be used to create a website. Themes can be downloaded from the Marketplace, while Hub CMS accounts also have access to HubSpot's default themes.

Page templates, whether websites or landing pages, use a drag-and-drop area section system.
The outermost container in a drag & drop (dnd) area is called a section. Sections cannot be nested in any other dnd element, but can contain modules, rows and columns.
Sections can be edited and dragged into the page editor by content creators.
Sections can be styled with their own backgrounds and padding.

settings_sezione
settings_sezione2

 

Compared to the templates that were used before on the pages, the difference is huge:

BEFORE NOW
templates created by the developer and used by the editors as they are  "default page" templates created by the developer but the editor can change, add, remove sections, modules, rows and columns as he likes

Working with the new templates has become easier for the editors because to add any module to the section, it will be enough to drag the element to the desired position.

Go to this page to see how to work with dnd area

structure