Configuration Management

Handles the full stack of config management from environment variables to feature flags and secret handling. You'll reach for this when setting up multi-environment deployments, implementing 12-factor app principles, or migrating credentials out of your codebase. Covers the practical stuff like config hierarchies, validation on startup, and integration with secret managers. The reference guides walk through everything from basic .env files to dynamic remote configuration. The best practices section is solid on the security fundamentals, like never committing secrets and using proper secret managers instead of rolling your own. Good coverage of the circular dependency trap where people try storing config in databases.