Joomla - Component: Create Hello World Component on Front End

I follow undocumented rule, learn programming for first time by creating "Hello World" page. I will show you how to create component Hello World. It realy easy.

1. Create "com_hello" folder under joomla/components
   
2. Create file "hello.php" within com_hello folder.
3. Write following code in hello.php:

   <?php
   defined( '_JEXEC' ) or die( 'Restricted access' );
   echo '<div class="componentheading">Hello World!</div>';
   ?>
   

4. If you install Joomla! on a local web server in a directory title joomla, the URL for accessing this component will be http://localhost/joomla/index.php?option=com_hello