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Sass File Structure

sass/
|
|– utilities
|   |– _variables.scss    // Sass Variables
|   |– _functions.scss    // Sass Functions
|   |– _mixins.scss       // Sass Mixins
|
|– base/
|   |– _reset.scss        // Reset/normalize
|   |– _typography.scss   // Typography rules
|
|– components/ (or modules/)
|   |– _buttons.scss      // Buttons
|   |– _carousel.scss     // Carousel
|   |– _slider.scss       // Slider
|
|– layout/
|   |– _navigation.scss   // Navigation
|   |– _grid.scss         // Grid system
|   |– _header.scss       // Header
|   |– _footer.scss       // Footer
|   |– _sidebar.scss      // Sidebar
|   |– _forms.scss        // Forms
|
|– pages/
|   |– _home.scss         // Home specific styles
|   |– _about.scss        // About specific styles
|   |– _contact.scss      // Contact specific styles
|
|– themes/
|   |– _theme.scss        // Default theme
|   |– _admin.scss        // Admin theme
|
|– vendors/
|   |– _bootstrap.scss    // Bootstrap
|   |– _jquery-ui.scss    // jQuery UI
|
`– main.scss              // Main Sass file

Utilities are reserved for mixins, variables, and functions that does not output any CSS when compiled.

Reference: Structuring your Sass Projects