Hello Magento Folks,
Here MageComp Comes with Tutorial Episode series for Magento 2, In Episode 1 you can learn How to Configure Order Comments in Magento 2.
If your Magento 2 store is lacking the order comment box at the checkout, get FREE Order Comments Extension for Magento 2 and enhance the user experience of your store.
Checkout Steps: How to Configure Order Comments in Magento 2