Joomla! Discussion Forums

Can i have please a link related to joomla security afther install 

For Joomla itself, you will have to look out for patches which might fix security issues. "Hardening" Joomla is more about taking a look at the levels below the CMS. This means server, PHP, database, and file system permissions. These areas are not exclusive to Joomla, and generic security measures for these areas need to be taken (when hosting your own server).

For security-related questions, start here: http://forum.joomla.org/index.php/topic,81058.0.html