How to add Unsubscribe Action link to an email template, when I am sending emails on users.

As shown below, to add on unsubscribe action or button.

Hello - Can anyone please guide me the how to start with the salesforce development learning. I am experienced in Admin part.
I know trailhead is the best platform, but need some real time exposure.
Or is there anyone who provide online training.

Thanks,
Abhishek Sinha
 

Hello - Can anyone please guide me the how to start with the salesforce development learning. I am experienced in Admin part.
I know trailhead is the best platform, but need some real time exposure.
Or is there anyone who provide online training.

Thanks,
Abhishek Sinha