This document provides tips for building and sustaining online communities. It recommends starting with a clear purpose and defining goals for who the community is for and how it will function. It also suggests slowly growing the community by recruiting engaged early members to set standards and represent different skills and perspectives. The document advises experimenting with tools to find the right mix, understanding community dynamics, empowering highly engaged users, and making it easy for others to participate. It stresses that community purpose is more important than any single tool and to set modest initial goals that can be measured and improved over time.