Hi Studio1MandS. Welcome to the forums.
HTML email is an awful way to learn coding, as email clients are notoriously backward in their support for HTML and CSS, meaning that you have to use hideous code from the 1990s to have any hope of an email rendering nicely.
So designs like the one you've posted are hopelessly impractical for HTML email. For one thing, background images are not well supported in email, and you have to use rotten old tables for layout, too.
My advice to you is scrap this design. Some very talented people have done a lot of work creating nice templates that work well across most email clients, such as here:
I recommend you try some of those.