Head section page and single, ad

I think I found it. in index.php, get_template_part( ‘content/archive-header’ ); ?> entries after do not appear on the search results page and 404 pages.
Is it correct?

I think the best solution will be to wrap the ad code in a conditional check, like this:

if ( is_page() || is_single() ) {
  // The ad code goes here
}

That code is saying, “if this is a page or a post, output the code inside.” Since 404 pages and search results are neither, the ad code won’t be output.

Will I do it this way? I did not fully understand.

if ( is_page() || is_single() ) {
<div class="reklamDes">
<div id="sagdakayan" >ADCODE</div>
<div id="soldakayan" >ADCODE</div></div>
}

Because this did not happen. ??

Your code just needs opening and closing PHP tags, and then it should work well:

<?php if ( is_page() || is_single() ) { ?>
  <div class="reklamDes">
  <div id="sagdakayan" >ADCODE</div>
  <div id="soldakayan" >ADCODE</div></div>
<?php } ?>

It worked the way I wanted it to be arranged like this:

<?php if ( is_page() || is_single() || is_archive() || is_home() ) { ?>
  AD CODES
<?php } ?>

Do you think there is a problem?

That code is perfectly fine. I didn’t understand the request fully until now, but you could rewrite it with less code like this:

<?php if ( !is_search() && !is_404() ) { ?>
  AD CODES
<?php } ?>

That says, “if the page isn’t the search results and it isn’t the 404 page, output the ad code.” It’s a little more precise for excluding the ad code from the search and 404 pages.

Thank you so much. It works well.
Moreover, by using both the above codes, I can that the ad I want is displayed on the page I want.