Where can l find free online tutorials to learn how to build cPanels/WHMs, and ANY web server? I've basically been wanting to learn how to build my own cPanels/WHMs, and servers in ANY programming language, database formats, operating systems, etc that I want, for the longest time, with any feature that I want to add to the cPanel/WHM and servers of mine to use.

Plus, it'll help me so if there are features that I want, and other cPanels/WHMs and servers don't have, then I could build it for myself to use on my personal cPanel/WHM and server. Also, with how expensive cPanels/WHMs and servers are, it's cheaper to build my own for myself. Thanks in advanced.

Are you looking to build your own control panel? If so I would suggest you go somewhere like http://thezpanel.com/ and join the development team. f you have needed skills like php or linux server administration they will probably let you join the team.

ISPConfig is also another good control panel, however it does lack some important qualities that the other paid control panels have.

http://www.ispconfig.org

HTH