Which list email report metric represents the total number of emails minus hard and soft bounces?

A user creates a copy of Email Template A, makes changes and saves as Email Template B. They send a list email using Email Template B. The user finds that Email Template As reporting metrics are not changing as a result of the new list email send.
Why would this occur?

A marketing user wants prospects to be added to a list when they click on a link in a list email. Where would this action be added in order to add the prospect to the specific list?

What is the process to add a prospect who visits a pricing page to a list?

What feature In Salesforce can be enabled to show landing page engagement data on a Salesforce Campaign page layout?