If you're building APIs for your microservices or mobile applications, you definitely want to try gRPC.
It is super-fast, strongly-typed, and you no longer need to write a lot of boilerplate codes for services communication. Thanks to awesome HTTP/2 and Protocol Buffer!
This is a 4-in-1 course, where you will learn not only gRPC, but also protocol-buffer and backend development with Go and Java. The codes in this course are production-grade, with well-organised structure and unit tests.