1.  Wordpress is a php based CMS( Content Management System )
 Open source
 Out-numbered free templates and plugins for easy development
 You can override any template functionlity

3.  The template file names are pretty logical
Quick overview of some template files
• header.php
• footer.php
• page.php
• single.php
• index.php
• sidebar.php

4.  Template tags let you insert dynamic content into your templates.
Include/function tags - Used to grab and display information or execute other
template files
<?php the_date(); ?>
<?php home_url(); ?>
<?php blog_info(); ?>
<?php wp_list_pages(); ?>
Conditional tags – Used to grab and display content depending on what page it
is and what condition it matches.
is_home();
is_single();
is_page();
is_category();

5.  Add a credit to the footer that uses include tags and a conditional tag

6.  What your template files need?
First, a name ( on top of your file )
<?php
/*
Template Name : [ Type your template name here ]
*/
Second, at least these 2 include tags
<?php get_header(); ?>
<?php get_footer); ?>
Last, any other content tag which you want to add

7.  You need to create your own function.php
 This file will controls almost all your business logic

8.  Magento
 Zendcart
 Drupal
 Joomla
and many other