Suppongo chefossepesante,maper rispondere allatua domanda originale,ho raccoltotuttigli ID deipostin un arraynelprimo cicloedescluso queipost dal secondo ciclo usando 'post__not_in' che si aspetta un array di IDpost

 <?php
$args1 = array('category_name' => 'test-cat-1', 'order' => 'ASC');
$q1 = new WP_query($args);
if($q1->have_posts()) :
$firstPosts = array();
    while($q1->have_posts()) : $q1->the_post();
        $firstPosts[] = $post->ID; // add post id to array
        echo '<div class="item">';
        echo "<h2>" . get_the_title() . "</h2>";
        echo "</div>";
    endwhile;
endif;
/****************************************************************************/
// array of post id's collected in first loop, can now be used as value for the 'post__not_in' parameter in second loops query $args
$args2 = array('post__not_in' => $firstPosts, 'order' => 'ASC' );
$q2 = new WP_query($args2);
if($q2->have_posts()) :
    while($q2->have_posts()) : $q2->the_post();
        echo '<div class="item">';
        echo "<h2>" . get_the_title() . "</h2>";
        echo "</div>";
    endwhile;
endif;
?>
 

Ilprimo ciclomostratuttii postin una categoriae raccogliegli ID deipostin un array.

Il secondo ciclomostratuttii post,esclusii post delprimo ciclo.

I suppose this was heavy, but to answer your original question, I've collected all of the posts id's in an array in the first loop, and excluded those posts from the second loop using 'post__not_in' which expects an array of post id's

<?php
$args1 = array('category_name' => 'test-cat-1', 'order' => 'ASC');
$q1 = new WP_query($args);
if($q1->have_posts()) :
$firstPosts = array();
    while($q1->have_posts()) : $q1->the_post();
        $firstPosts[] = $post->ID; // add post id to array
        echo '<div class="item">';
        echo "<h2>" . get_the_title() . "</h2>";
        echo "</div>";
    endwhile;
endif;
/****************************************************************************/
// array of post id's collected in first loop, can now be used as value for the 'post__not_in' parameter in second loops query $args
$args2 = array('post__not_in' => $firstPosts, 'order' => 'ASC' );
$q2 = new WP_query($args2);
if($q2->have_posts()) :
    while($q2->have_posts()) : $q2->the_post();
        echo '<div class="item">';
        echo "<h2>" . get_the_title() . "</h2>";
        echo "</div>";
    endwhile;
endif;
?>

The first loop displays all posts in a category, and collects the post id's into an array.

The second loop displays all posts, excluding posts from the first loop.

Ilparametro che stai cercando è post__not_in (kaiser ha unerrore dibattituranella sua risposta).Quindiil codicepotrebbeessere:

 <?php
$my_query = new WP_Query(array(
    'post__not_in' => array(278),
    'post_type' => 'case-study',
    'paged' => $paged,
));
while ($my_query->have_posts()) : $my_query->the_post(); endwhile;
 

WP_Querypost__not_in documentazione

The parameter you are looking for is post__not_in (kaiser has a typo in his answer). So the code could be like:

<?php
$my_query = new WP_Query(array(
    'post__not_in' => array(278),
    'post_type' => 'case-study',
    'paged' => $paged,
));
while ($my_query->have_posts()) : $my_query->the_post(); endwhile;

WP_Query post__not_in documentation

Devi definire l'argomento post__not_in come array.Ancheper un singolo valore.Eperfavorenon sovrascrivere le variabiliprincipaliglobali conelementitemporanei.

 <?php
$query = new WP_Query( array(
    'post_type'    => 'case-study',
    'paged'        => $paged,
    'post__not_in' => array( 1, ),
) );
if ( $query->have_posts() ) {
while ( $query->have_posts() ) {
    $query->the_post();

    // do stuff

} // endwhile;
} // endif;
?>
 

You have to define the post__not_in arg as array. Even for a single value. And please don't overwrite global core variables with temporary stuff.

<?php
$query = new WP_Query( array(
    'post_type'    => 'case-study',
    'paged'        => $paged,
    'post__not_in' => array( 1, ),
) );
if ( $query->have_posts() ) {
while ( $query->have_posts() ) {
    $query->the_post();

    // do stuff

} // endwhile;
} // endif;
?>

Codici alternativi;

Escludipost di categoria

 <?php
add_action('pre_get_posts', 'exclude_category_posts');
function exclude_category_posts( $query ) {
    if($query->is_main_query() && $query->is_home()) {
        $query->set('cat', array( -22, -27 ));
    }
}
 

Rimuovii post dallapagina della homepage

 <?php
add_action('pre_get_posts', 'wpsites_remove_posts_from_home_page');
function wpsites_remove_posts_from_home_page( $query ) {
    if($query->is_main_query() && $query->is_home()) {
        $query->set('category__not_in', array(-1, -11));
    }
}
 

Alternative codes;

Exclude category posts

<?php
add_action('pre_get_posts', 'exclude_category_posts');
function exclude_category_posts( $query ) {
    if($query->is_main_query() && $query->is_home()) {
        $query->set('cat', array( -22, -27 ));
    }
}

Remove posts from homepage page

<?php
add_action('pre_get_posts', 'wpsites_remove_posts_from_home_page');
function wpsites_remove_posts_from_home_page( $query ) {
    if($query->is_main_query() && $query->is_home()) {
        $query->set('category__not_in', array(-1, -11));
    }
}