Also the blog posts on grpc.io are interesting, but I find them harder to discover whilst reading the documentation. But here they are: https://grpc.io/blog/
Grasping the concept of a context/deadlines is quite helpful:
https://grpc.io/blog/deadlines/
You could also find related information in the Google SRE Handbook (Service Level Objectives): https://landing.google.com/sre/sre-book/chapters/service-lev...
If you are familiar with Go, the article about "Context" might also be helpful: https://blog.golang.org/context
But in any case, gRPC is language agnostic and has nothing to do with Go.
To get an idea how to create an api-repository with protobuf defintions to be shared by multiple services/clients, one can look at: https://github.com/googleapis/googleapis