There are many folders, each one about one golang topic.
Goplayground | https://play.golang.org/
Godoc org | https://golang.org/doc/
Concurrency | https://golangvedu.wordpress.com/2017/03/23/golang-concurrency-part-i/
How to Mock | https://blog.learngoprogramming.com/how-to-mock-in-your-go-golang-tests-b9eee7d7c266
How to Write Go Code | https://golang.org/doc/code.html
Golang Project Layout | https://github.com/golang-standards/project-layout
Learn Go With Tests | https://quii.gitbook.io/learn-go-with-tests/
Code Review Comments Pratices | https://github.com/golang/go/wiki/CodeReviewComments
Function As Field | https://www.geeksforgeeks.org/function-as-a-field-in-golang-structure/#:~:text=A%20structure%20or%20struct%20in,be%20represented%20as%20a%20struct.