Education is an act of gaining knowledge. It must be contrasted with maturing (which is gaining wisdom) on one hand and schooling (which is gaining professional skills, normally under the control of the government) on another.
Education is a necessary step of development for every child.
One of the most productive ways of education is self-education because it is done at the pace and in the direction which the student desires. It, of course, presupposes self-discipline because without nothing is done.