Cpanel provides necessary server information like resource usage, Mysql, PHP version, allowed domains etc on the left corner of the home page.
The first portion contains the information like main domainname, home directory & resource usage.
Click on "expand stats" for more details.
In this portion, you will get information like resource quota and usage of email accounts, subdomains,parked domains, database resource, disk space quota for database and emails.
The remaining portion will show the details like Apache Version, Perl Version, Path to Perl, Path to sendmail, installed perl modules, PHP Version, MySQL Version, cPanel Version.