Cyborgzz wrote:From where i can view all the Demos of Php Versions like php3.0.2,php3.0.1 and etc
If you mean the ACP (admin control panel), try using Google.
Here's a short video:
Be sure to click "watch in high quality". The video is a bit blurry.
The best way to learn phpBB3 is to get down and dirty with it in the ACP. See what does what and make mistakes. You'll learn as you go, and you'll figure out how to make a more efficient and organized setup when you finally do go live.
phpBB 3.0.3 is coming out soon (don't ask when). What I suggest is getting 3.0.2 right now, play with it, then go live with a fresh installation of 3.0.3 (or later) and make the setup you want.