Two online learning experts share lessons gained during a decade of developing and refining massive open online courses (Moocs). As we look back over 10 years of producing massive open online courses (Moocs), we can be very proud of our achievements, with the 100 courses reaching more than 4.5 million students all over the world. As part of our commitment to open education, more than 1,000 of the videos we produced have been shared as open educational resources (OERs): freely downloadable, editable and reusable under Creative Commons licences.