Need help in htaccess.

Hello to all,

I am working on site.
Now i am facing few problems with it.

I have the following urls point as my home page

http://example.com/
http://www.example.com/
http://www.example.com/index.php
http://www.example.com/Home/

can I just have one url with htacess.
www.example.com

Please help me and try to give me best answer in brief. I don't have much knowledge in Htaccess.

Thanks

 

My httaccess

Options +FollowSymlinks
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* home.php [L]

now what shoild i write in that?