Custom Post Type with all the options.

example-custom-post-type.php

<?php
if ( ! function_exists('portfolio_post_type') ) :

  // Add Portfolio Projects to WordPress
  add_action( 'init', 'portfolio_post_type', 0 );
  
  // Register Portfolio Projects Custom Post Type
  function portfolio_post_type()
  {
      $labels = array(
          'name'                  => _x( 'Portfolio', 'Post Type General Name' ),
          'singular_name'         => _x( 'Project', 'Post Type Singular Name' ),
          'menu_name'             => __( 'Portfolio Projects' ),
          'name_admin_bar'        => __( 'Portfolio Project' ),
          'archives'              => __( 'Portfolio Archives' ),
          'parent_item_colon'     => __( 'Parent Project:' ),
          'all_items'             => __( 'All Projects' ),
          'add_new_item'          => __( 'Add New Project' ),
          'add_new'               => __( 'Add New' ),
          'new_item'              => __( 'New Project' ),
          'edit_item'             => __( 'Edit Project' ),
          'update_item'           => __( 'Update Project' ),
          'view_item'             => __( 'View Project' ),
          'search_items'          => __( 'Search Projects' ),
          'not_found'             => __( 'Not found' ),
          'not_found_in_trash'    => __( 'Not found in Trash' ),
          'featured_image'        => __( 'Featured Image' ),
          'set_featured_image'    => __( 'Set featured image' ),
          'remove_featured_image' => __( 'Remove featured image' ),
          'use_featured_image'    => __( 'Use as featured image' ),
          'insert_into_item'      => __( 'Insert into project' ),
          'uploaded_to_this_item' => __( 'Uploaded to this project' ),
          'items_list'            => __( 'Projects list' ),
          'items_list_navigation' => __( 'Projects list navigation' ),
          'filter_items_list'     => __( 'Filter projects list' ),
          );
      $rewrite = array(
          'slug'                  => 'portfolio',
          'with_front'            => true,
          'pages'                 => true,
          'feeds'                 => true,
          );
      $args = array(
          'label'                 => __( 'Project' ),
          'description'           => __( 'Portfolio projects for Apgar Digital LLC.' ),
          'labels'                => $labels,
          'supports'              => array( 'title', 'editor', 'excerpt', 'thumbnail', 'revisions', ),
          'taxonomies'            => array( ),
          'hierarchical'          => false,
          'public'                => true,
          'show_ui'               => true,
          'show_in_menu'          => true,
          'menu_position'         => 5,
          'menu_icon'             => 'dashicons-portfolio',
          'show_in_admin_bar'     => true,
          'show_in_nav_menus'     => true,
          'show_in_rest'          => true,
          'can_export'            => true,
          'has_archive'           => 'portfolio',
          'exclude_from_search'   => false,
          'publicly_queryable'    => true,
          'rewrite'               => $rewrite,
          'capability_type'       => 'page',
          );
      register_post_type( 'portfolio', $args );
  }
  endif;
?>