Watching for possible gotchas while creating script files in Unity

Notice line 4 in the following screenshot:

public class LearningScript : MonoBehaviour 

The class name LearningScript is the same as the filename LearningScript.cs. This is a requirement. You probably don't know what a class is yet, but that's okay. Just remember that the filename and the class name must be the same.

When you create a C# script file in Unity, the filename in the Project tab is in Edit mode, ready to be changed. Please rename it right then and there. If you rename the script later, the filename and the class name won't match. The filename would change, but line 4 will be this:

public class NewBehaviourScript : MonoBehaviour 

This can easily be fixed in MonoDevelop by changing NewBehaviourScript in line 4 to the same name as the filename, but it's much simpler to do the renaming in Unity immediately.