Conclusion: Docker Is Just the Beginning
The most important thing I learned from Docker wasn't "Docker itself" but "container thinking." The philosophy of isolating applications, treating infrastructure as immutable, and defining everything declaratively.
Now "It works on my machine" is no longer an excuse. With a Dockerfile and docker-compose.yml, anyone can reproduce the exact same environment.
Looking forward, WebAssembly (Wasm) might replace containers for certain workloads. But the core idea of "defining environments as code" will never disappear.
I hope this article saves someone from a 3 AM deployment disaster.