Dependency management and Go
I find dependency management and package managers interesting. Each language has its own package manager, and each one has characteristics that are specific to that community. NuGet for .NET has great tooling and Visual Studio support, since that's important to the .NET developer audience. NPM has a super flexible model, and great command line tools.
In a lot of ways, golang is a little quirky. And that's awesome. However - I've really struggled to wrap my head around dependency management in Go.