# Key Concepts

- [Snapshot](/etiq-1.x-documentation/key-concepts/snapshot.md)
- [Scan](/etiq-1.x-documentation/key-concepts/scan.md)
- [Config](/etiq-1.x-documentation/key-concepts/config.md): Configuration file description
- [Custom Tests](/etiq-1.x-documentation/key-concepts/custom-tests.md): How to set up your own metrics to run regular scans and RCA type scans