Your cPanel contains most of what you need to manage your site. You can park domains, create subdomains, create email accounts, filter email, forward email, create and manage MySQL databases, create and manage mailing lists, easily install several available scripts for forms, forums, guestbooks, etc., change your contact email address, and much more. This is where you will find your site statistics to see how popular your site is and with whom. It is also where you can see what account resources you have used and how much is left.
A manual for cPanel is available at
https://documentation.cpanel.net/display/ALD/cPanel+User+Documentation
