Module configuration paths in Magento

Magento uses a predictable directory structure for configuration files. Module configuration files live in the etc directory within your module, for example:

app/code/Vendor/Module/etc/
├── di.xml               # Dependency injection config
├── module.xml           # Module declaration
├── config.xml           # Default configuration values
├── events.xml           # Event observers

For area-specific configurations, Magento uses the following subdirectories:

app/code/Vendor/Module/etc/
├── frontend/            # Frontend-specific configs
├── adminhtml/...