Docker in 20 Minutes: Everything You Need to Start Containerizing Stop saying "it works on my machine." Here's Docker, explained simply. What Problem Does Docker Solve? WITHOUT Docker: Your app: "Works on my laptop! 🎉" Server: "Doesn work. Node version wrong. Library missing. OS different." 💀 WITH Docker: Your app: "Here's a box with everything inside. Run this box." 📦 Server: "Running the box. Works perfectly." ✅ Enter fullscreen mode Exit fullscreen mode Docker packages your app + dependencies into a container that runs identically everywhere. Docker vs VM (Quick) Virtual Machine: ┌─────────────────────────────────────┐ │ Host Operating System │ │ ┌───────────────────────────────┐ │ │ │ Guest OS (full Linux) │ │ │ │ ┌─────────────────────────┐ │ │ │ │ │ Your App │ │ │ │ │ │ + Dependencies │ │ │ │ │ └─────────────────────────┘ │ │ │ └───────────────────────────────┘ │ └─────────────────────────────────────┘ Heavy: Full OS per VM = GBs of space, minutes to boot Docker Container:…