Learn PostgreSQL from Edx

Edx, is a massive open online course (MOOC) provider. It hosts online university-level courses in a wide range of disciplines to a worldwide student body, including some courses at no charge. It also conducts research into learning based on how people use its platform. EdX is a nonprofit organization and runs on the free Open edX open-source software platform.The Massachusetts Institute of Technology and Harvard University created edX in May 2012. More than 140 schools, nonprofit organizations, and corporations offer or plan to offer courses on the edX website. As of 29 December 2018, edX has around 18 million students taking more than 2,200 courses online. - read more on Wikipedia