Displaying an image Behind the header Title - any tuto?

Hi helpers :),
mmm… I cant find the way to place a background image (code lines) behind my Title : “Your Website” on the Heaer section of the page ?
any tutos about this ?
…most of what I found only explain how to display images frames under the Title.
…or more sofisticated sliding section effects… :frowning:

background%20image
background image.jpg1838×506 409 KB

Tks

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