1
It seems to be pretty simple,
The default e-mail template that is sent by Magento is:
Customer: vendor/magento/module-sales/view/frontend/email/order_new.html
Guest: vendor/magento/module-sales/view/frontend/email/order_new_guest.html
You must not edit those files directly on vendor. They can be loaded on admin panel:
Marketing > Communications > ...
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