Yeah, the fact that Mono is inheriting all BCL code from .NETCore nowadays, but is still not .NETCore (because it has its own runtime) is a bit confusing. That

Yeah, the fact that Mono is inheriting all BCL code from .NETCore nowadays, but is still not .NETCore (because it has its own runtime) is a bit confusing. That being said, the best/easiest way to use .NET in the Mac is just install "Visual Studio for Mac" (the Community edition is completely free), which will under the hood install all you need (Mono, .NET Core, etc).