I am using Drupal Commerce in Drupal 8.
Where can I find the default email and rules related to order activities, like on completion, processing etc.
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Email templates can be found in module subdirectories: https://docs.drupalcommerce.org/commerce2/developer-guide/orders/customize-order-receipt-emails
For D8, commerce is not using rules any more, but states machine and event subscribers, check order workflows / checkout flows https://docs.drupalcommerce.org/commerce2/developer-guide/orders/workflows