Each Google spreadsheet comes with below sheets. Some of these sheets are meant for configurations while some are meant for adding data.
Below is the list of various sheets in each spreadsheet.
This sheet primarily controls the main settings like display of navigation bar, header, body, footer etc
This sheet contains the default configuration for entire site. If a specific sheet don't has a specific configuration, the default values get picked from this sheet.
This sheet defines the configuration for navigation bar (called as Navbar).
This sheet defines the configuration for header
This sheet defines the configuration for body.
This sheet contains the data for the cards
This sheet defines the configuration for filters used in Body-Cards
This sheet contains the data of design/text require in the body
This sheet contains the details on all the internal pages of your site. This could be a 'Contact us' page or 'About us' page or any internal page of the site.
This sheet defines the configuration for footer.
This sheet contains various other settings related site's meta data, favicon, chat integrations etc
This sheet can be used as you want. Some usecase could be using this sheet to hold temporary data before you add data to Body-Cards. You can safely ignore using this sheet.
Don't Edit - As the name suggest, don't edit the contents of this sheet. IMPORTANT.