What’s the Golang Pareto for an Golang developer?

A few days ago I read the post "What’s the VIM Pareto for an IT professional?" on reddit and it gave me the idea to ask exactly the same for Golang.

I am aware that many things depend on the developer's area of responsibility. The answer of a CLI/TUI developer looks different than someone who writes microservices or web applications or desktop applications. I would just be interested in your answer, maybe with a small addition of what you focus on developing.

Which modules of the standard library and additional libs do you think of or what from Golang roadmap belongs to the 20% of Golang to do 80% of the Golang dev's tasks in your opinion?

Thank you for your answer!