Is employment the only way to make use of one's education, how in many ways can a person benefit the society from his/her education?

Thanks for the invitation. I agree with the answers provided. Also I suggest entrepreneurship as another alternative to produce income and benefit the society. 

Work - writing books - tips - Studies and Research

No, its not only employment that our education will be useful. Actually, we are applying everyday our education  for dealing with other people like our bosses, co workers, family, friends, neighbors and etc because we are taught in our schools not only our courses but they added also values education and ethics that helps us to be a disciplined person. In our society, if we are good in our work, friendly and respectful then many people will tell you that you are an educated person.

Through training, courses, and expertise in the field of work, and through volunteer work.

agree with expert answers above