Which file should a developer use to set the default value when creating configuration fields for admin?

When creating configuration fields for the admin panel and setting their default values, a developer

should use the etc/config.xml file within their module. This file is used to declare default values for

the module's configuration options. When Magento is installed or the module is enabled, these

values are automatically loaded into the database, under the core_config_data table, setting the

initial configuration for the module. This approach ensures that the module has sensible defaults and

operates correctly upon installation​​