Until you learn some basic concepts of programming, it's too early to study how scripts work, but you still need to know how to create one.
There are several ways of creating a script file using Unity:
- In the menu, navigate to Assets | Create | C# Script
- In the Project tab, navigate to Create | C# Script
- Right-click on the Project tab, and from the pop–up menu, navigate to
Create | C# Script
All of these ways create a .cs file in the Unity Assets folder. From now on, whenever I tell you to create a C# script, use whichever method you prefer.