I am writing simle console apps in C#. But I would like it if I had a good UI to use. Since we live in an age where everything is run off the internet or intranet through a web browser, should I use a javascript frame work? What is a good choice for that? If I am using the UI to access and upload local files, like excel data files, what would be a good suggestion to use? Is there a bare-bones javascript suggestion that I can use?

There is a lot of talk online that WPF is not a good choice anymore and is losing popularity and support. Is it being replaced by something like Blazor?