More information on statements, expressions, and operators can be found at https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/statements-expressions-operators/.
There is a video available on the Packt Publishing site that's helpful as well. It's called Programming in C# .NET (https://search.packtpub.com/?query=70-483&refinementList%5Breleased%5D%5B0%5D=Available).