> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lumintheme.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Theme editor basics

> Sections, blocks, templates, and the overlay group in LuminOS

# Theme editor basics

LuminOS is an Online Store 2.0 theme: most pages are built from **sections** and nested **blocks**.

## Sections vs blocks

* **Sections** — full-width (or page-width) units you add to a template (hero, FAQ, product information, Lumin Meta Reviews).
* **Blocks** — pieces inside a section (text, buttons, quantity breaks, review stars).

Use **Add section** / **Add block** in the left sidebar of the theme editor.

## Templates

Each template (home, product, collection, page, cart) has its own section stack. Switching templates on a product or page in Admin changes which stack merchants see.

Useful LuminOS templates include product presets and page templates such as bundle, changelog, and theme features.

## Overlay group

Email popup and cart drawer live in the **overlay** / app-like layer (header-adjacent groups), not as ordinary page sections. Look for:

* **Cart drawer** — see [Cart drawer](https://docs.lumintheme.com/guides/cart-drawer.md)
* **Email popup**

Edits there apply storewide.

## Lumin sections builder

The **Lumin sections** section is a flexible wrapper for composing content blocks quickly on landing pages. Prefer dedicated feature sections (bundle builder, Meta Reviews, FAQ) when you need those behaviors.

## Apps and data

Some blocks expect Shopify data:

* Metaobjects for [Meta Reviews](https://docs.lumintheme.com/guides/meta-reviews.md)
* Metafields for [siblings](https://docs.lumintheme.com/guides/sibling-products.md) and [FBT](https://docs.lumintheme.com/guides/frequently-bought-together.md)
* Apps for [discounts](https://docs.lumintheme.com/guides/lumin-discount-app.md) and [Kit reviews](https://docs.lumintheme.com/guides/lumin-kit-reviews.md)

## Still stuck?

Post in [Customization](https://community.lumintheme.com/c/customization) with the template name and a screenshot of the editor sidebar.


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