What advice would you give to someone that is just venturing into the world of "Overlanding"?

Backpacking in a 4x4? Less sweat & exertion, but often more dust... I was "car camping" from a truck long before I heard the title "overlanding" applied to what we do. Also the Marines, oddly enough, introduced me to using a four-wheel drive vehicle to traverse the desert. Found I really enjoyed!

What is Overlanding?