Registers a custom post type for a theme

register_post_type

register_post_type( string $post_type, array|string $args = array() )

Example: add in function.php file

function create_posttype() {
	 
	    register_post_type( 'movies',
	    // CPT Options
	        array(
	            'labels' => array(
	                'name' => __( 'Movies' ), // plural and first latter capital
	                'singular_name' => __( 'Movie' ) 
	            ),
	            'public' => true,
	            'has_archive' => true, // display inarchiv page 
	            'rewrite' => array('slug' => 'movies'), // use for url name  www.example.com/movies/
	        )
	    );
	}

Hooking up our function to theme setup

add_action( 'init', 'create_posttype' );

>>	init
	for insert data using _GET or _POST method

>>	Here movies slug of post type , labels is display name in dashboard menu