he error message suggests that the compiler is unable to access the instance method WorldToScreen of the GameGui object. It is likely that GameGui has not been initialized, or is not accessible within the scope of the method that is calling Point(). Here are some possible solutions:

Check if GameGui is being initialized correctly: Make sure that the GameGui object is being initialized properly, either by creating a new instance of it or by retrieving an existing instance. Double-check that the WorldToScreen method is accessible from the scope of Point(), and that the necessary using statements are included at the top of the file.

Change the method signature to static: If it is not necessary for Point() to access any instance-specific data or methods from GameGui, you could change the signature of WorldToScreen() to public static bool WorldToScreen(Vector3 worldPos, out Vector2 screenPos). This will allow Point() to access the WorldToScreen() method without needing to create an instance of GameGui.

Pass in the GameGui object as a parameter: If you have an instance of GameGui that is accessible from the scope of Point(), you can pass it in as a parameter to the method. For example, you could change the method signature to internal void Point(GameGui gameGui, Vector3 worldPos) and call it with Point(myGameGui, myWorldPos).

As for resources, the Microsoft Docs website has a comprehensive guide to troubleshooting C# code in Visual Studio, which you may find helpful: https://docs.microsoft.com/en-us/visualstudio/debugger/troubleshooting-tips-for-csharp-programmers-in-visual-studio?view=vs-2022. Additionally, the C# Programming Guide on the Microsoft Docs website provides a thorough introduction to C# programming concepts, syntax, and best practices: https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/.
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