10 Serverless security best practices` are outlined in a cheat sheet series, covering various aspects of securing serverless deployments. The key points include patching function dependencies, adopting the principle of least privilege, maintaining isolated function perimeters, sanitizing event input to avoid injection attacks, employing API gateways as a security buffer, monitoring and logging functions, following secure coding conventions for application code, securing and verifying data in transit, managing secrets in secure storage, and deploying functions in minimal granularity. These best practices aim to reduce the attack surface of serverless applications and prevent common security vulnerabilities.