Concise course/book on Golang with indepth explanations

I am an experienced developer, and have worked in languages like Javascript and Java. I have started learning Go language from a Todd McLeod course, but I find it to be quite easy because I am aware of the basic syntax and the constructs. I also checked one of the books Go in Action, but the explanations are quite lengthy.

Can anyone recommend no-nonsense tutorial/book/course for experienced programmers who want to write robust code for real-world applications?

This is still the one book everybody should own and read:

A very advanced book is The Way to Go by Ivo Balbaert.

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