As a .NET developer, there's a difference between saying .NET and .NET Core, however.
You can be interested in .NET Core but not in .NET in general if you're looking for cross-platform applications, for example.
Having used .NET for almost a decade, I think I selected .NET Core for a couple options since I hadn't been able to learn about the differences. And there's pretty significant differences, especially tooling support (like the inability to really do database-first as easily as you can with .NET).
Thanks they hadn't put a Silverlight instead of .NET. StackOverlow makes this mistake third year in a row. It is not .NET Core, it is .NET.
.NET Core is just yet another implementation of .NET runtime.