Concurrency vs parallelism in Go: applied to...

Rob Pike said in 2012: "Concurrency is about dealing with lots of things at once. Parallelism is about doing lots of things at once." Everyone nods at the conference. Nobody asks a question. And then you go home and still have no idea what it actually changes in your code. This article starts from scratch: what the difference is, how Go expresses it with goroutines and channels, and why it matters as soon as you start working with architectures like Event Sourcing or CQRS. No advanced Go knowled