CPanel
This page has a variety of information on cPanel servers.
General Information
Common Ports - Common ports that are used on cPanel Servers
cPanel Scripts - Listing and brief explanations for common cPanel Scripts
View sent notifications:
/var/cpanel/user_notifications/root/history/
LAMP Stack
Software Versions - What versions of Linux, Apache, php, mySQL, etc are installed?
DNS - DNS in WHM and cPanel
Logs
Log Locations - Where are log files?
exim exim is the SMTP mailserver
Other
Solr - cPanel uses Solr to index and search mail messages.