I have some divs in an html file. Now in each div a href should be the same as img src.
That means if img src looks like this: <img src="media/gallery/Mr. G.jpeg">
then the a href, in which the img is, should look automaticly like this:
<a href="media/gallery/Mr. G.jpeg">

In the screenshot you can see my code, can anyone help me?
my div

I have tried unsuccessfully to write code with javascript. I am currently still learning and am unfortunately not so good at JS yet.

You can get all the container elements with document.querySelectorAll, then loop over them to set each href to match the image.

document.querySelectorAll('.content_section_item').forEach(el => {
	const a = el.querySelector('a');
	a.href = a.querySelector('img').src;
});