Don't be fooled by the cheesy title. This article, recommended by Max, explains the ways of thinking with reactive programming - and how it's really not that different than "traditional" programming. A quick read.
A video! Because let's be honest, even though we love recommending articles, we watch a ton of videos. This one was recommended by Jacob - it is great as an introduction to microservices for beginners and it holds guidance on implementation for more experienced folks.