Start by creating the container structure using a Group block with content width set to 840 pixels (matching classic Bosco’s site container). This constrains inner content while keeping the group itself full-width.
Create header and footer template parts through the site editor, starting blank and naming them appropriately. Build the header with site title and navigation blocks, and the footer with a simple paragraph containing your footer text.
After saving and exporting with Create Block Theme, manually add the templateParts registration to theme.json. This associates your header and footer files with their proper areas and enables correct icons and functionality.
The manual theme.json step is essential – without it, your template parts won’t register properly as headers and footers, missing important visual cues and organizational benefits.