Create Custom Post Type with Category in WordPress without plugin

<?php
function news_custom_post()
{
    $args = array(
 'labels'   => array(
 'name'  => 'Custom Post',
 'singular_name' => 'custom',
 ),
 'hierarchical'  => true,
 'public' => true,
 'has_archive' => true,
 'menu_icon'   => 'dashicons-welcome-write-blog',
 'supports' => array('title', 'editor', 'thumbnail'),
);

register_post_type('custom post', $args);
}
add_action('init', 'news_custom_post');
?>

Syntax:

<?php
function function-name()
{
    $args = array(
 'labels'   => array(
 'name'  => 'Any Custom-Post-Name',
 'singular_name' => 'singular-name of Custom-Post-Name',
 ),
 'hierarchical'  => true,
 'public' => true,
 'has_archive' => true,
 'menu_icon'   => 'dashboard wordpress icon shortcode',
 'supports' => array('title', 'editor', 'thumbnail'),
);

register_post_type('Any Custom-Post-Name', $args);
}
add_action('init', 'function-name');
?>

Output: