you don't need to learn it. :-D you already know it, you just need to write it. There are a few things to understand defer, goroutines,channels, interfaces, structs etc.

We also have to give credit to the author. Good programmers have programs that are easy to read and understand.

However like all languages that are easy to read, it can be deceptive. Once you dive into any big/complex project. Context and design decisions matter more than anything else.