What literature on the Go language have you studied and can recommend?

For learning Go, I recommend the following books:

• "The Go Programming Language" by Alan A. A. Donovan and Brian W. Kernighan — a classic for a deep understanding of the language.
• "Go in Action" by William Kennedy — good for practical mastery.
• "Go Programming Blueprints" — contains examples of real projects.

It is also useful to read the official documentation at golang.org and practice with examples.