Open Networked Learning (ONL) is a collaborative open online course for higher education educators worldwide, focusing on open education, collaborative learning, and course design. The interorganizational course welcomes both institutional and open learners from around 30 nations. Delivered 17 times since 2014 with up to 120 participants in each session, ONL employs problem-based learning to foster digital competencies and strengthen community development. Rooted in the European Framework for Digital Competence of Educators (DigCompEdu), a study involving 48 participants revealed statistically significant, across-the-board competence enhancement post-course, affirming ONL's efficacy. The article also summarizes our experiences and learnings from participating in and organising the course over the past ten years.