Module Creating In Drupal

At minimal, create 2 kind of files:
1. hello.info

  name = Hello Module   ; this will appear in the module 

                        ; configuration and other display text

  description = A module for displaying text  

  package = My Module   ; categories your module

  core = 7.x

2. hello.module
   <?php

   /**

    * Implements hook_menu()

    *

    * Simply provide a menu entry

    */

   function hello_menu(){

        $item['hello/morning'] = array(

            'title' => 'Hello, Good Morning!',

            'description' => 'Greeting Message',

            'page callback' => 'lol',

            'access callback' => TRUE

         );

         return $item;

    }

     /**

      * Provide simply text greeting message

      */

     function lol(){

        return t('Hello, how are you today? We hope you are all right');

     }

3. You have just finished. Now place the two file in a hello folder, then archive it.
4. Open your Drupal administration page, then install the module. Then enable it
5. See in the navigation menu, and try to click it.