> For the complete documentation index, see [llms.txt](https://docs.opencart.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.opencart.com/design.md).

# DESIGN

- [Layouts](https://docs.opencart.com/design/layouts.md): Managing store layouts and module positions in OpenCart 4
- [Banners](https://docs.opencart.com/design/banners.md): Creating and managing promotional banners in OpenCart 4
- [SEO URL](https://docs.opencart.com/design/seo-url.md): Configuring SEO-friendly URLs and URL aliases in OpenCart 4
- [Theme Editor](https://docs.opencart.com/design/theme-editor.md): Edit template files and create theme overrides using the built-in Theme Editor in OpenCart 4
- [Language Editor](https://docs.opencart.com/design/language-editor.md): Editing language translations and text strings in OpenCart 4