When the PC was new, nearly everyone who used one knew how to write simple programs. Today, not so much. Enter Codecademy. Newbies can take free courses on topics such as HTML, CSS and JavaScript, with badges and other features that help track progress and provide an incentive to keep on learning. People who already know how to code can use the site to teach courses on their areas of expertise. Whether you just want to build a personal website or aspire to be a professional programmer, it’s an inspiring place to be.