Linux পরিচিতি ও Installation

🐧 Linux কেন Server-এ?

• Free, stable, lightweight
• Strong security, full control
• Internet 90%+ Linux Server

📦 Distros

• Ubuntu — most popular। সেরা পছন্দ।
• Debian — super stable
• Rocky / RHEL — enterprise
• Alpine — Docker tiny (5MB)

📁 Filesystem

/           root
/home       user homes
/etc        config (nginx, mysql)
/var        variable (logs, db, www)
  /var/log/      logs
  /var/www/      web files
/usr/bin    executables
/opt        3rd party
/tmp        temporary
/proc, /sys virtual (kernel)
/dev        device files

💻 Local Setup

1. WSL 2 (Windows) — best for dev
2. VirtualBox VM
3. Docker Desktop
4. Cloud VPS $5/month — real experience

🪟 WSL Setup

# PowerShell as Admin
wsl --install
wsl --set-default-version 2
wsl --list --online
wsl --install -d Ubuntu-22.04

🚀 Cloud VPS Options

• DigitalOcean $5 — 1GB
• Hetzner $4 — best price/perf
• Vultr / Linode — alternative
• AWS Lightsail $3.5

🎓 মূল কথা ⭐

Production = Ubuntu LTS (22.04, 24.04)। Local dev = WSL 2 fastest। শেখার জন্য $5 VPS — real experience।