Hi @burhanuddin00,
Welcome to our community! 
In which course and lecture are you?
The InputSystem refers to the new input system. If you use an older version of Unity, it might be that you’ll have to install the “Input System” package via Window > Package Manager, then set the “Active Input Handling” in Edit > Project Settings > Player to “Input System (new)”.
See also:
- Forum User Guides : How to apply code formatting within your post
- Forum User Guides : How to mark a topic as solved
Thank You Miss! it solved the problem thank you for your guidance