Where can I find methods in C#'s available namespaces?

Question

I want to learn more about coding. But I don't know where I can find more methods. Do you know the library that show all methods I can add to my code by using their namespaces in C#?

Answer 1

https://docs.microsoft.com/en-us/dotnet/csharp/

Answer 2

Goooo Microsoft website

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/methods