Go is actually a pretty complex language, more so than Java for example, in my opinion. It has all sorts of primitives that you need to get used to, special rules for how the built-in types work, there are all sorts of rules to see what creates a copy of a struct and what doesn't, pointers have at least three completely different use-cases (optionality, mutability, and avoiding copies), several rules for what can and can't be addressed etc. And this is all before looking at the standard library.