# Tutorial 6: Advanced Patterns

Fork (parallel branches), Repeat (retry loops), Timer (delays), and External Signal (wait for events).

## Patterns

| Pattern | Use When |
|---------|----------|
| **Fork** | Multiple independent operations that should run concurrently |
| **Repeat** | Retry a service call with backoff, poll until condition met |
| **Timer** | Delay between steps (backoff, scheduled processing) |
| **External Signal** | Wait for an external event (document upload, approval from another system) |

## Variants

- [C# Fluent DSL](csharp/)
- [Canonical JSON](json/)

## Next

[Tutorial 7: Shared Helpers](../07-shared-helpers/) — organizing reusable workflow components.