Customize Invoice on Magento 2

I have seen a few older posts regarding modifying the invoice on Magento 2. Some are outdated based on an update in Magento. Does anyone have a good overview to edit the invoice?

Goal:

  1. Add customer email to the invoice (ship to or Bill to area)
  2. Alternating color on the product listing rows.

I have tried a few solutions without any luck on Magento 2.3.3. I have even purchased a plugin and the team was not happy with the new layout. We tried address templates but could get email to work

submitted by /u/jimiz
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