# Tutorials

Step-by-step tutorials for building applications with Svrnty.CQRS.

## Overview

This section provides comprehensive, hands-on tutorials that walk you through building real-world applications using Svrnty.CQRS.

## Tutorial Series

### [Modular Solution](modular-solution/)

Build a properly structured solution with separated concerns:

1. **[Solution Structure](modular-solution/01-solution-structure.md)** - Create project structure (Api, CQRS, Domain, Infrastructure)
2. **[Domain Layer](modular-solution/02-domain-layer.md)** - Define entities, value objects, and domain events
3. **[CQRS Layer](modular-solution/03-cqrs-layer.md)** - Implement commands, queries, and handlers
4. **[DAL Layer](modular-solution/04-dal-layer.md)** - Set up Entity Framework Core and repositories
5. **[API Layer](modular-solution/05-api-layer.md)** - Configure HTTP and gRPC endpoints
6. **[Testing Strategy](modular-solution/06-testing-strategy.md)** - Unit and integration testing

**What You'll Learn:**
- Multi-project solution architecture
- Layer separation and dependencies
- Best practices for code organization
- Testing strategies for each layer

**Prerequisites:**
- .NET 10 SDK
- Basic understanding of C# and ASP.NET Core

**Duration:** ~2-3 hours

### [Event Sourcing](event-sourcing/)

Build an event-sourced application from scratch:

1. **[Fundamentals](event-sourcing/01-fundamentals.md)** - Event sourcing concepts and benefits
2. **[Aggregate Design](event-sourcing/02-aggregate-design.md)** - Design aggregates and domain events
3. **[Events and Workflows](event-sourcing/03-events-and-workflows.md)** - Implement event workflows
4. **[Projections](event-sourcing/04-projections.md)** - Build read models from events
5. **[Snapshots](event-sourcing/05-snapshots.md)** - Optimize with snapshots
6. **[Replay and Rebuild](event-sourcing/06-replay-and-rebuild.md)** - Replay events to rebuild projections

**What You'll Learn:**
- Event sourcing pattern
- Aggregate root design
- Projection building
- Event replay
- Snapshot optimization

**Prerequisites:**
- Completed "Getting Started" guide
- Understanding of domain-driven design
- PostgreSQL installed

**Duration:** ~3-4 hours

### [E-Commerce Example](ecommerce-example/)

Build a complete e-commerce order system:

1. **[Requirements](ecommerce-example/01-requirements.md)** - Define domain and requirements
2. **[Domain Events](ecommerce-example/02-domain-events.md)** - Design order lifecycle events
3. **[Commands](ecommerce-example/03-commands.md)** - PlaceOrder, CancelOrder, ShipOrder
4. **[Queries](ecommerce-example/04-queries.md)** - GetOrder, ListOrders, SearchOrders
5. **[Projections](ecommerce-example/05-projections.md)** - Order summaries and analytics
6. **[Sagas](ecommerce-example/06-sagas.md)** - Order fulfillment saga
7. **[HTTP API](ecommerce-example/07-http-api.md)** - Expose via HTTP endpoints
8. **[gRPC API](ecommerce-example/08-grpc-api.md)** - Expose via gRPC services
9. **[Complete Code](ecommerce-example/09-complete-code.md)** - Full working implementation

**What You'll Learn:**
- Real-world CQRS application
- Event-driven workflows
- Saga pattern for distributed transactions
- Dual HTTP/gRPC endpoints
- Complete working code

**Prerequisites:**
- Completed "Modular Solution" tutorial
- PostgreSQL installed
- Understanding of e-commerce domain

**Duration:** ~4-6 hours

## Quick Start Projects

### Hello World CQRS

```bash
# Create new project
dotnet new webapi -n HelloCQRS
cd HelloCQRS

# Add packages
dotnet add package Svrnty.CQRS
dotnet add package Svrnty.CQRS.MinimalApi

# Create command
# Create handler
# Register services
# Run
```

See [Getting Started](../getting-started/README.md) for full guide.

### Event Streaming Quick Start

```bash
# Add event streaming
dotnet add package Svrnty.CQRS.Events.PostgreSQL
dotnet add package Svrnty.CQRS.Events.ConsumerGroups

# Start PostgreSQL
docker run -d -p 5432:5432 -e POSTGRES_PASSWORD=postgres postgres:16

# Configure services
# Publish events
# Consume events
```

See [Event Streaming Getting Started](../event-streaming/fundamentals/getting-started.md) for full guide.

## Learning Path

### Beginner

1. [Introduction to CQRS](../getting-started/01-introduction.md)
2. [Your First Command](../getting-started/03-first-command.md)
3. [Your First Query](../getting-started/04-first-query.md)
4. [Adding Validation](../getting-started/05-adding-validation.md)

### Intermediate

1. [Modular Solution Tutorial](modular-solution/README.md)
2. [Dynamic Queries](../core-features/dynamic-queries/README.md)
3. [gRPC Integration](../grpc-integration/getting-started-grpc.md)

### Advanced

1. [Event Sourcing Tutorial](event-sourcing/README.md)
2. [Consumer Groups](../event-streaming/consumer-groups/README.md)
3. [Projections and Sagas](../event-streaming/projections/README.md)
4. [E-Commerce Example](ecommerce-example/README.md)

## Sample Code

All tutorial code is available in the [Svrnty.Sample](../../Svrnty.Sample/) project.

**Key Examples:**
- [Commands](../../Svrnty.Sample/Commands/)
- [Queries](../../Svrnty.Sample/Queries/)
- [Events](../../Svrnty.Sample/Events/)
- [Projections](../../Svrnty.Sample/Projections/)
- [Sagas](../../Svrnty.Sample/Sagas/)
- [Workflows](../../Svrnty.Sample/Workflows/)

## Community Examples

Share your tutorials and examples:
- Submit a pull request with your tutorial
- Link to your blog post or GitHub repo
- Join the discussion on GitHub

## See Also

- [Getting Started](../getting-started/README.md)
- [Best Practices](../best-practices/README.md)
- [Samples](../samples/README.md)
- [Troubleshooting](../troubleshooting/README.md)