Loop two different category WP_Query

Your final outlook is a bit tricky to achieve using traditional way. Lets assume both category has at least 6 post. Now first grab the posts using get_posts() not ~~WP_Query~~

$side_news = get_posts(array(
    'post_type' => 'post',
    'category_name' => 'category-slug-1',
    'posts_per_page' => 6
));

$side_news2 = get_posts(array(
    'post_type' => 'post',
    'category_name' => 'category-slug-2',
    'posts_per_page' => 6
));

now that we know we have 6 post each let’s merge the result as alternative position.

$c_result = array();
while(!empty($side_news) || !empty($side_news2)) {
    if(!empty($side_news)) {
        $result[] = array_shift($side_news);
    }
    if(!empty($side_news2)) {
        $result[] = array_shift($side_news2);
    }
}

Now we have an array with 12 posts. Let’s loop through it and achieve the final layout:

echo '<div class="row m-0">';
$i = 0;
foreach ($c_result as $post) {
    $i++;

    $id = $post->ID;
    $title = $post->post_title;
    $content = $post->post_content;

    if($i%2 == 0):
        echo"<div class="col-8">$id $title $content</div>";
    else:
        echo"<div class="col-4">$id $title $content</div>";
    endif;
}
echo '</div>';

get_posts() returns post as object with following keys:

WP_Post Object
(
    [ID] =>
    [post_author] =>
    [post_date] => 
    [post_date_gmt] => 
    [post_content] => 
    [post_title] => 
    [post_excerpt] => 
    [post_status] =>
    [comment_status] =>
    [ping_status] => 
    [post_password] => 
    [post_name] =>
    [to_ping] => 
    [pinged] => 
    [post_modified] => 
    [post_modified_gmt] =>
    [post_content_filtered] => 
    [post_parent] => 
    [guid] => 
    [menu_order] =>
    [post_type] =>
    [post_mime_type] => 
    [comment_count] =>
    [filter] =>
)

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