Open source is fundamentally about collaboration, providing a framework that includes version control, licenses, and issue trackers to facilitate collective efforts and create outcomes beyond individual capabilities. On GitHub, open source projects vary widely in scale, from single-contributor projects to those like Homebrew with thousands of contributors. The nature of activity in these projects shifts as the number of contributors grows, with solo projects primarily consisting of code pushes, while larger projects see a rise in conversational interactions such as issue comments and pull request reviews. The transition from closed to open source, as exemplified by projects like Atom and Roslyn, often results in a significant increase in activity. Open source projects thrive not just on code contributions but also on documentation, support, and community discussions, highlighting the importance of engagement beyond coding. Those interested in participating in open source are encouraged to explore guides to find suitable projects and contribute in diverse ways beyond just writing code.