This document discusses levelling up in open source projects from one coder to working in a group. It notes that most solo projects go nowhere but some succeed if they have influence, serve a niche, or have the right design. When a second person joins, the solo coder must adapt to things like version control, documentation, and coding standards. As a project grows, infrastructure like mailing lists, issue tracking, and version control repositories become necessary to manage communications and development. Proper use of these services can help projects scale up from small teams to larger groups.