sentences:  In 2012 his team designed the first European MOOC platform openHPI which provides many free online courses in the field of IT-technologies.Meanwhile, openHPI counts more than 500.000 enrollments (August 2018) and more than 175.000 unique users.He also offers various massive open online courses, for example on Blockchains , Internet Security for Beginners, Internet and Web Technologies with about 10.000 enrolled learners each.