Learn how to develop and contribute to Julia packages in this comprehensive 55-minute tutorial. Explore community resources like Discourse and Slack for support, set up development environments with Juno and GitKraken, and master package building essentials. Discover modules usage, interactive package updates, continuous integration testing setup, and package registration. Gain hands-on experience with "dev"ing packages for local editing, submitting pull requests, and fixing bugs in existing packages. Cover topics including code writing, testing, CI implementation, managing external dependencies, versioning, and navigating open-source communities. Perfect for aspiring Julia package developers and contributors looking to enhance their skills and make meaningful contributions to the Julia ecosystem.