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Learn Cello¶

Master Cello through hands-on learning. Whether you're writing your first route or architecting distributed systems, there's a guided path for you. Pick your level and start building.

Learning Path¶

Follow the progression from beginner to advanced to build your skills step by step:

graph LR
    B["Beginner"]:::beginner --> I["Intermediate"]:::intermediate --> A["Advanced"]:::advanced

    B1["Installation"] --> B2["Quick Start"] --> B3["First App"] --> B4["REST API"]
    I1["Auth System"] --> I2["Chat App"] --> I3["Testing"] --> I4["Error Handling"]
    A1["Microservices"] --> A2["Performance"] --> A3["Deployment"] --> A4["Enterprise Patterns"]

    B --- B1
    I --- I1
    A --- A1

    classDef beginner fill:#1A1A1A,stroke:#4caf50,color:#4caf50
    classDef intermediate fill:#1A1A1A,stroke:#FF9100,color:#FF9100
    classDef advanced fill:#1A1A1A,stroke:#e53935,color:#e53935

Tutorials¶

Step-by-step guides to build complete, working applications from scratch.

  • Build a REST API

    30 min | Beginner

    Build a full CRUD API with input validation, error handling, and structured responses.

    Start Tutorial

  • Build a Chat App

    45 min | Intermediate

    Create a real-time WebSocket chat application with multi-client broadcasting.

    Start Tutorial

  • Authentication System

    60 min | Intermediate

    Implement JWT authentication with login, refresh tokens, and role-based access.

    Start Tutorial

  • Microservices

    90 min | Advanced

    Build communicating microservices with service discovery and message passing.

    Start Tutorial

Guides¶

In-depth guides on specific topics to deepen your expertise.

  • Best Practices

    Code organization, security patterns, performance tips, and project structure conventions.

    Read Guide

  • Error Handling

    RFC 7807 Problem Details, custom exception handlers, and structured error responses.

    Read Guide

  • Testing

    Unit tests, integration tests, mocking, test clients, and CI/CD integration.

    Read Guide

  • Performance Tuning

    Optimization strategies, profiling, benchmarking, and production configuration.

    Read Guide

  • Production Deployment

    Docker, Kubernetes, reverse proxies, monitoring, and zero-downtime deployments.

    Read Guide

Architectural Patterns¶

Proven patterns for building robust, maintainable applications at scale.

  • Repository Pattern

    Abstract data access behind clean interfaces for testability and flexibility.

    Learn Pattern

  • Service Layer

    Organize business logic in dedicated service classes with clear boundaries.

    Learn Pattern

  • Event-Driven

    Decouple components with event publishing and subscription for loose coupling.

    Learn Pattern

  • CQRS

    Separate read and write models for optimized queries and scalable commands.

    Learn Pattern

Suggested order for the best learning experience

Phase 1 -- Get Running (Day 1)

  1. Installation -- Set up your environment
  2. Quick Start -- Build and run your first endpoint
  3. Build a REST API -- Complete CRUD tutorial

Phase 2 -- Go Deeper (Week 1)

  1. Error Handling Guide -- Structured error responses
  2. Authentication System -- JWT & RBAC
  3. Testing Guide -- Write reliable tests
  4. Best Practices -- Code organization & patterns

Phase 3 -- Level Up (Week 2-3)

  1. Real-time Chat App -- WebSocket communication
  2. Performance Tuning -- Optimize for production
  3. Production Deployment -- Docker & Kubernetes

Phase 4 -- Go Enterprise (Month 2+)

  1. Microservices Tutorial -- Distributed architecture
  2. CQRS Pattern -- Command/query separation
  3. Enterprise Features -- Database, Redis, GraphQL
Looking for... Go to
"How do I install Cello?" Installation
"Show me a basic REST API" REST API Tutorial
"How do I add authentication?" Auth System Tutorial
"How do I write tests?" Testing Guide
"How do I deploy to production?" Deployment Guide
"How do I use WebSockets?" Chat App Tutorial
"What patterns should I use?" Architectural Patterns
"Show me all features" Features Overview

Community Resources¶

Learn with the Community