Magento_Checkout module
Magento\Checkout module allows merchant to register sale transaction with the customer. Module implements consumer flow that includes such actions like adding products to cart, providing shipping and billing information and confirming the purchase.
Observer
This module observes the following events
etc/events.xml
sales_quote_save_after
event in
Magento\Checkout\Observer\SalesQuoteSaveAfterObserver
file.
/etc/frontend/events.xml
customer_login
event in Magento\Checkout\Observer\LoadCustomerQuoteObserver
file.
customer_logout
event in Magento\Checkout\Observer\UnsetAllObserver
Layouts
The module interacts with the following layout handles in the
view/frontend/layout
catalog_category_view
catalog_product_view
checkout_cart_configure
checkout_cart_configure_type_simple
checkout_cart_index
checkout_cart_item_renderers
checkout_cart_sidebar_item_price_renderers
checkout_cart_sidebar_item_renderers
checkout_cart_sidebar_total_renderers
checkout_index_index
checkout_item_price_renderers
checkout_onepage_failure
checkout_onepage_review_item_renderers
checkout_onepage_success
default