What is diffrence between version of joomla 1.5 & 1.6

Hello every one , I was working on joomla 1.6 and trying to customizing the CMS But it is not just same as joomla 1.5 so i was failing to customizing .Plz help me .Any body can help me to build a website .

There is no simple answer to this questions but I think you can find it here:
http://www.joomla.org/component/content … /5252.html
http://joomlatp.com/joomla-1.5-tutorials/Differences-Between-Joomla-1.0-and-1.5.html