Can someone explain ground driving to me?

Geez.....talk about a bunch of useless answeres.... ground driving or long lining is a crucial part of ground work that teaches a young horse to move forward, feel rein pressure, learn to turn, give to bit pressure, stop, back and learn bending and collection and a balanced way of moving in a 3 gaits without a rider on their back.....It is not for beginners and takes a lot of talent and excellent hands to teach all of these things correctly....I think there are some decent videos on Youtube either under ground driving or long lining....If you have never done it before I would see if you know someone who is well versed and can help you start right and then teach you the proper technique...Good luck