By Linda Peng, a software engineer at Mailchimp, this article shares 10 lessons learned from maintaining an open source community, CodeBuddies, over four years. The author reflects on the growth of the community, its challenges, and how they were addressed through various strategies such as hosting live code walkthroughs, using GitHub's features to advantage, recognizing non-monetary rewards for contributors, managing conflicts, taking breaks, and prioritizing roadmap decisions. The article emphasizes the importance of creating a sustainable open source project by giving back to the community, recognizing contributors' efforts, and taking care of one's own needs as a maintainer. The author invites readers to contribute or participate in CodeBuddies, an international community that has grown into a vibrant ecosystem of learners working together to improve their technical skills and explore new technologies.