function cptui_register_my_cpts_blog() {

    /**
     * Post Type: Blog.
     */

    $labels = array(
        "name" => __( "Blog", "testsite" ),
        "singular_name" => __( "Blog Post", "testsite" ),
    );

    $args = array(
        "label" => __( "Blog", "testsite" ),
        "labels" => $labels,
        "description" => "",
        "public" => true,
        "publicly_queryable" => true,
        "show_ui" => true,
        "show_in_rest" => false,
        "rest_base" => "",
        "has_archive" => true,
        "show_in_menu" => true,
        "exclude_from_search" => false,
        "capability_type" => "post",
        "map_meta_cap" => true,
        "hierarchical" => false,
        "rewrite" => array( "slug" => "blog", "with_front" => true ),
        "query_var" => true,
        "menu_icon" => "dashicons-media-document",
        "supports" => array( "title", "revisions" ),
    );

    register_post_type( "blog", $args );
}

add_action( 'init', 'cptui_register_my_cpts_blog' );

function cptui_register_my_taxes_blog_types() {

    /**
     * Taxonomy: Blog Types.
     */

    $labels = array(
        "name" => __( "Blog Types", "testsite" ),
        "singular_name" => __( "Blog Type", "testsite" ),
        "menu_name" => __( "Update Blog Types", "testsite" ),
    );

    $args = array(
        "label" => __( "Blog Types", "testsite" ),
        "labels" => $labels,
        "public" => true,
        "hierarchical" => false,
        "label" => "Blog Types",
        "show_ui" => true,
        "show_in_menu" => true,
        "show_in_nav_menus" => false,
        "query_var" => true,
        "rewrite" => array( 'slug' => 'blog_types', 'with_front' => true, ),
        "show_admin_column" => false,
        "show_in_rest" => false,
        "rest_base" => "",
        "show_in_quick_edit" => false,
    );
    register_taxonomy( "blog_types", array( "blog" ), $args );
}

add_action( 'init', 'cptui_register_my_taxes_blog_types' );

$args = array(
    'post_type' => 'blog',
    'posts_per_page' => -1,
    'tax_query' => array(
        array(
            'taxonomy' => 'blog_types',
            'field' => 'slug',
            'terms' => 'tips',
        ),
    ),
);

// Custom query.
$query = new WP_Query( $args );