I've posted a few links by Mr. Money Moustache, advocating living within one's means as a pretty easy way to retire at age 30. Whatever your age, if taking control of your financial life interests you, then find you way around MMM's great site through this easy to read article on
Getting Rich: From Zero to Hero in One Blog Post. Highly recommend read (also be warned that you will probably spend a good few hours devouring this blog, once you start).