app/code/Magento/OfflineShipping/README.md
This module implements the shipping methods which do not involve a direct interaction with shipping carriers, so called offline shipping methods. Namely, the following:
Before installing this module, note that this module is dependent on the following modules:
Magento_StoreMagento_SalesMagento_QuoteMagento_QuoteMagento_SalesRuleThe Magento_OfflineShipping module creates the shipping_tablerate table in the database.
This module modifies the following tables in the database:
salesrule - adds column simple_free_shippingsales_order_item - adds column free_shippingquote_address - adds column free_shippingquote_item - adds column free_shippingquote_address_item - adds column free_shippingFor information about a module installation, see Enable or disable modules.
Extension developers can interact with the Magento_OfflineShipping module. For more information about the extension mechanism, see Plugins.
The dependency injection mechanism enables you to override the functionality of the Magento_OfflineShipping module.
A lot of functionality in the module is on JavaScript, use mixins to extend it.
This module introduces the following layouts in the view/frontend/layout directory:
checkout_cart_indexcheckout_index_indexFor more information about a layout, see the Layout documentation.
This module extends following ui components located in the view/adminhtml/ui_component directory:
sales_rule_formsalesrulestaging_update_formFor information about a UI component, see Overview of UI components.
You can get more information about offline shipping methods at the following articles: