flowchart TB
    subgraph Fundamentals["1️⃣ Fundamentals"]
        direction TB
        Intro["Introduction to Node.js"]
        Arch["Node.js Architecture & Event Loop"]
        NPM["npm & package.json"]
        Modules["Modules: CommonJS vs ESM"]
        Core["Core Built-in Modules"]
    end

    subgraph Core["2️⃣ Core Concepts"]
        direction TB
        Async["Async Programming"]
        Events["Event Emitter"]
        Streams["Streams & Buffers"]
        Errors["Error Handling"]
    end

    subgraph Web["3️⃣ Web Development"]
        direction TB
        API["Building REST APIs"]
        Express["Express.js Framework"]
        Validation["Input Validation"]
        Uploads["File Uploads"]
        Auth["Authentication & Security"]
        WS["WebSockets & Real-Time"]
        GraphQL["GraphQL"]
    end

    subgraph Data["4️⃣ Data Layer"]
        direction TB
        DB["Databases (MongoDB / SQL)"]
        Cache["Caching (Redis)"]
        Queues["Message Queues"]
    end

    subgraph Production["5️⃣ Production"]
        direction TB
        Config["Config & Environment"]
        Logging["Logging & Monitoring"]
        Perf["Performance Optimization"]
        Patterns["Design Patterns"]
        Clustering["Clustering & Worker Threads"]
        ProdArch["Production Architecture"]
        Deploy["Deployment"]
        Testing["Testing"]
        Micro["Microservices & Project Architecture"]
    end

    subgraph Advanced["6️⃣ Advanced Topics"]
        direction TB
        Addons["Native Addons"]
        CLI["CLI Tools"]
        ES["Event Sourcing"]
        Mono["Monorepos"]
        Wasm["WebAssembly"]
    end

    subgraph SysDesign["7️⃣ System Design"]
        direction TB
        URL["URL Shortener"]
        Chat["Chat System"]
        Rate["Rate Limiter"]
        Task["Task Management"]
        Ecom["E-Commerce Backend"]
    end

    Interview["🎯 Interview Questions"]

    Fundamentals --> Core --> Web --> Data --> Production --> Advanced --> SysDesign --> Interview

    style Fundamentals fill:#4f46e5,color:#fff
    style Core fill:#7c3aed,color:#fff
    style Web fill:#059669,color:#fff
    style Data fill:#d97706,color:#fff
    style Production fill:#dc2626,color:#fff
    style Advanced fill:#0891b2,color:#fff
    style SysDesign fill:#db2777,color:#fff
    style Interview fill:#6366f1,color:#fff