long answer if you're asking about witchcraft or magic. the paths are very personal, and if something doesn't feel right to a person, they can alter it so it does. like rituals, some people use old English, others feel uncomfortable and use modern. some feel you should wear robes in the circle only, while other feel you should wear them every day [see Laurie Cabot]
witchcraft is the study of magic. while Embrace makes an excellent point, i feel that would make more sense for a 'witch' and not 'witchcraft' witch is the person, witchcraft is the application imo. as a witch you need to study about everything [history, plants, cooking, exercise, spell craft] then apply it in your daily life, be it through magic or not, and it can then be called witchcraft.
magic is energy. easiest way to describe it, you're drawing in the energy found all around us, focusing it on a single task [healing for instance] then releasing any that is left over to be recycled and used once again.