```html Nirmal DevOps Academy

IT Fundamentals Learning Portal

Click any topic and learn through simple explanations and diagrams.

🏢 Data Center

Servers, Racks, Power & Cooling

💻 Operating System

Understand how Ubuntu works

🌐 Networking

Internet, Router & Switch Concepts

💾 Storage

SSD, HDD, SAN & NAS

🐧 Linux Ubuntu

Learn Linux Fundamentals

☁️ Cloud Basics

Understand Cloud Easily

🏢 Data Center

A Data Center is a building where servers, storage and networking devices are kept. 

              INTERNET
                   |
              FIREWALL
                   |
               SWITCH
              /  |   \
             /   |    \
        SERVER SERVER SERVER
              |
           STORAGE

Real Example: Facebook, Google and Amazon store their servers inside data centers.

💻 Operating System

Operating System acts as a manager between user and hardware. 

User
 |
Applications
 |
Ubuntu OS
 |
Kernel
 |
CPU / RAM / Disk

Example: When Chrome opens, Ubuntu manages CPU and RAM usage.

🌐 Networking

Networking means connecting devices so they can communicate. 

           INTERNET
               |
            ROUTER
               |
            SWITCH
            /    \
        Laptop  Server

Example: When you watch YouTube, networking connects your phone to Google's servers.

💾 Storage

Storage is used to keep data permanently. 

Applications
      |
   Storage
   /     \
 HDD     SSD

SSD is faster than HDD and commonly used in modern servers.

🐧 Linux Ubuntu

Ubuntu is a Linux operating system widely used in servers and cloud. 

User
 |
Shell
 |
Kernel
 |
Hardware

Linux allows users to manage files, services and applications efficiently.

☁️ Cloud Basics

Cloud means renting IT resources over the internet. 

User
  |
Internet
  |
Cloud Provider
(AWS/Azure/GCP)
  |
Servers Storage Network

Instead of buying servers, companies rent resources from cloud providers.

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