In wordpress you can create custom posts , Suppose in your WP site you want to create a Movie list then you can use this custom post type ,

To create custom posts type you have to first invoke register_post_type() through init action, Lets suppose we want to add books type, write following code in your theme function.php

add_action( 'init', 'create_post_type' );
function create_post_type() {
    register_post_type( 'books',
        array(
    'labels' => array('name' => __( 'Books' ),
    'singular_name' => __( 'Book' ),
    'add_new' => __( 'Add New ' ),
    'add_new_item' => __( 'Add New Book' ),
    'edit' => __( 'Edit' ),
    'edit_item' => __( 'Edit Books' ),
    'new_item' => __( 'New Books' ),
    'view' => __( 'View Books' ),
    'view_item' => __( 'View Books' ),
    'search_items' => __( 'Search Books' ),
    'not_found' => __( 'No books found' ),
    'not_found_in_trash' => __( 'No books inTrash' ),
    'parent' => __( 'Parent Books' ),
            ),
        'public' => true,
        'has_archive' => true,
        )
    );
}

for menu item of you want to give custom image to it , then you can pass one more parameter in

'menu_icon' => get_stylesheet_directory_uri() . '/images/books-logo.png',

also you have menu_position to set menu position in Admin menu

Now we will show custom posts using WP query

 $loop = new WP_Query( array( 'post_type' => 'books', 'posts_per_page' => 10 ) ); ?>

while ( $loop->have_posts() ) : $loop->the_post(); 
    
the_title( )
    

        the_content(); 
    
 endwhile; 

you can also check if your custom posts exists or not

if ( is_post_type( 'books' ) )
    echo 'Books are there!';
else
    echo 'Sorry!';