http://www.itworld.com/sites/all/themes/itworld/images/answers-logo-small.pngBy . The best free educational resources on the web can be found here. If there's something you want to learn, you probably don't have to pay for it. Top universities like Stanford, Harvard, Yale, MIT, and Oxford offer hundreds of free courses to teach you everything from astronomy to political science and beyond. Open Culture makes it easy to find and download these free audio and video lectures (27,000 hours in total!).
I mentioned Open Culture last year, but since then the organization has been busy curating 175 more resources to keep you busy for a lifetime of learning. More...