Azure Bicep is gaining popularity as a replacement for Azure Resource Manager (ARM) templates, and it's essential to understand its security fundamentals to ensure secure configuration deployment. Keeping secrets out of source control is crucial, and methods such as passing parameters via command line or using a parameters JSON file can help achieve this. The `@secure` decorator can be used to secure inputs, but outputs defined in Bicep can pose a risk if not handled properly. To mitigate this, it's recommended to not return secrets as outputs in Bicep. Instead, resources can be accessed using the existing keyword or Key Vault to retrieve secrets securely. Additionally, Snyk's free CLI can be used to perform IaC scans locally against security and compliance standards, even if it doesn't directly support Bicep format.