I would learn ASP.NET Core. It's a significant design shift that has some growing pains for the community but will be a big improvement. I like Core because it'

I would learn ASP.NET Core. It's a significant design shift that has some growing pains for the community but will be a big improvement. I like Core because it's easier to build a minimal website (without all the bloat that comes with ASP.NET 4 and previous, like System.Web). Also your application specifies most of the behavior now, rather than relying on IIS configuration. Performance benchmarks have also been exciting: https://github.com/aspnet/benchmarks https://github.com/aspnet/benchmarks