Here is the break down of it:
Theme Structure – Groups & Pairs:
Shopify’s new theme architecture with “groups” and “pairs” is part of the ongoing push for more flexible and modular customization.
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Groups are used to organize related settings or blocks under one visual section in the theme editor.
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Pairs represent label-value pairs or two interdependent inputs (like an image and caption). They make theme settings more structured and intuitive.
Blocks within Blocks (Nested Blocks):
Shopify now allows nesting of blocks inside other blocks, useful for components like tab sections or product cards. This helps developers define reusable and dynamic UI layouts without duplicating logic.