Being pedantic, what does he mean by "learn"? I'm sure I could look at Go code and roughly explain what it does, or take a problem and roughly explain how to d

Being pedantic, what does he mean by "learn"? I'm sure I could look at Go code and roughly explain what it does, or take a problem and roughly explain how to do it in Go. I'm sure it would take 3 months of misery or 3 months of practice for me to be able to write Go from scratch as quickly as Python. And there's really no reason to learn 500 languages. There's barely reason to learn 10.