As stated on the About page of Go on Exercism:
Go is known for its strong concurrency features, built-in support for parallelism, a rich set of networking packages in the standard library (such as a web server), and its fast compilation and execution speeds.
Given this, it’s a bit surprising that topics like threading, concurrency, and goroutines are not covered in the Go learning path. These are key aspects of the language, and I believe including lessons on them would significantly benefit the community.
Thank you to all the maintainers, contributors, and founders of Exercism for creating and supporting this incredible nonprofit platform.