In recent years, the proliferation of software supply chain attacks has highlighted the critical importance of ensuring the security of the software development and distribution process. Open-source projects are an essential part of today’s software supply chain: they both rely on and are relied upon by third-party libraries, frameworks, components, and complete products. Therefore, it is crucial for open-source projects to take great care in avoiding vulnerabilities that can, directly or indirectly, compromise the integrity and confidentiality of software systems. To assist its projects in addressing these challenges, the Eclipse Foundation has established a security team dedicated to helping projects strengthen their supply chain. In this tutorial, the Eclipse Foundation's Security Team will provide a comprehensive overview of software supply chain security, covering essential concepts, best practices, and practical techniques.