[Theme: Twenty Fourteen] Display posts with certain categories only

use a ‘pre_get_posts’ action in functions.php of the theme (ideally a child theme);

https://codex.www.ads-software.com/Plugin_API/Action_Reference/pre_get_posts

either include only one category for the posts page https://codex.www.ads-software.com/Plugin_API/Action_Reference/pre_get_posts#Show_Only_One_Category_on_Home_Page

or alternatively exclude one category https://codex.www.ads-software.com/Plugin_API/Action_Reference/pre_get_posts#Exclude_categories_on_your_main_page

Thanks for the response.

So it seems like excluding posts with category “video” from posts page makes the most sense.

So would I just copy and paste this code anywhere in the functions.php file?

function exclude_category( $query ) {
    if ( $query->is_home() && $query->is_main_query() ) {
        $query->set( 'cat', '-1,-1347' );
    }
}
add_action( 'pre_get_posts', 'exclude_category' );

But replace the example above’s category to be excluded with my “video” category?

Well that didnt work.

Heres what I have in the functions.php file…

<?php
//
// Recommended way to include parent theme styles.
//  (Please see https://codex.www.ads-software.com/Child_Themes#How_to_Create_a_Child_Theme)
//
add_action( 'wp_enqueue_scripts', 'theme_enqueue_styles' );
function theme_enqueue_styles() {
    wp_enqueue_style( 'parent-style', get_template_directory_uri() . '/style.css' );
    wp_enqueue_style( 'child-style',
        get_stylesheet_directory_uri() . '/style.css',
        array('parent-style')
    );
}
//
// Your code goes below
//

// START To remove category of video showing on posts page

function exclude_category( $query ) {
    if ( $query->is_home() && $query->is_main_query() ) {
        $query->set( 'cat', '-video' );
    }
}
add_action( 'pre_get_posts', 'exclude_category' );

// END To remove category of video showing on posts page

Heres a link to the site… https://www.buildlab.xyz/

in this line:

$query->set( 'cat', '-video' );

'cat' expects the category ID, not the slug

https://codex.www.ads-software.com/Class_Reference/WP_Query#Category_Parameters

Ok, I now have this and its not working…

function exclude_category( $query ) {
    if ( $query->is_home() && $query->is_main_query() ) {
        $query->set( 'category_name=video' );
    }
}
add_action( 'pre_get_posts', 'exclude_category' );

And its giving me this error…

Warning:Missing argument 2 for WP_Query::set(), called in /home/rhemox/buildlab.xyz/wp-content/themes/buildlab_childtheme_20_14/functions.php on line 23 and defined in /home/rhemox/buildlab.xyz/wp-includes/query.php on line 2369

Ok, I got it to work. I looked up the category ID and used this…

function exclude_category( $query ) {
    if ( $query->is_home() && $query->is_main_query() ) {
        $query->set( 'cat', '-14' );
    }
}
add_action( 'pre_get_posts', 'exclude_category' );