Redirect Your Home Page To Website Root

To let google or any other search engine index only the home page of your website its required to redirect your index.php or index.htm or whatever it is to your website root for example http://www.yourwebsite.com. In this way a single version of your home page exists and page rank is not divided among different versions.
If you are running apache server appending below two lines to your .htaccess file will do the trick
RewriteCond %{THE_REQUEST} ^.*/index.php
RewriteRule ^(.*)index.php$ http://www.yourwebsite.com/$1 [R=301,L]
Remember to replace www.yourwebsite.com with your website address.
301 Redirect your home page to a new url
Additionally if you want to 301 redirect your home page to a different website
RewriteEngine on
RewriteRule ^$ http://www.yournewwebsiteurl.com [R=301,L]