This talk from Real World Crypto (RWC) 2025 explores essential practices for properly open-sourcing code, drawing on valuable lessons learned from the Linux Foundation. Presented by Hart Montgomery during the Web PKI and Open Source session chaired by Marie-Sarah Lacharité, the 16-minute presentation offers practical guidance for developers and organizations looking to contribute to the open-source community effectively. Discover key considerations, common pitfalls to avoid, and best practices that ensure your open-source contributions achieve maximum impact and sustainability. The talk represents one segment of a four-part session dedicated to Web PKI and Open Source topics at the conference. For more comprehensive information, including abstracts and additional contributors, visit the official RWC 2025 program page at https://rwc.iacr.org/2025/program.php.