Here you can find some useful links direct from cPanel company.
Note that not all resources may be available to your account/plan.
- The cPanel Interface – https://confluence2.cpanel.net/display/ALD/The+cPanel+Interface
- Videos – https://www.youtube.com/playlist?list=PLZk46idJS6s54hAX8K79_AY8brgBwPtHd
- cPanel Features List – https://confluence2.cpanel.net/display/ALD/cPanel+Features+List