Pay attention here! Magento 2 Checkout Custom Fields extension is in place to optimize the default boring checkout! Feel free to add new fields for any information you think to be necessary for order fulfillment.
Add any number of Magento 2 custom fields to checkout
Use those fields as Magento 2 order attributes to improve management
Show custom fields in Order grid & on Order Detail page
Add Magento 2 order custom attributes to transaction emails and documents...