I would suggest watching this video and looking at the slides: http://www.acko.net/drupalcon Or buy the Drupal eBook: *http://tinyurl.com/az2zf*

Amit Karpe wrote:

Hi , I am using box_cleanslate_smarty theme . But I am very new to this world . I do not have clear concepts of Theme and engine and template . Where I can find good material ? After googling I got this things . http://drupal.org/node/11774 http://drupal.org/book/export/html/509

Thanks in advance