I have that big ass Wrox book, something like "C# for Professionals 2.0" or something and I think it is pretty good - at least it covers a number of topics that interest me that "tutorial" books ...
Multithreading support for client-side Blazor WebAssembly apps is planned for .NET 8 in November 2023, but developers can try it out now for .NET apps thanks to experimental functionality in the brand ...