I understood the scope of the function but in the min. 1:23 it's very confusing because when you see the demonstration.

Hello Abubakr Alhaj,

I think I know why you might be confused. I'll try my best to help clarify any issues. By calling the greeting() function, it allows him to use the 'var lilah' and 'alert(person)' stored within it. However, in order to use the 'var george', since it's stored outside of the function, it has to be called separately. Hence, why he typed 'alert(person);' after calling 'greeting()'. So, in other words, when calling any function, the arguments inside of it's body don't affect the arguments outside of it.

In other words, greeting() was called this would display lilah because the alert function to call lilah is within the function itself, then he wrote another alert(person) below it, this would display george because this var george was declared outside of the function, then again he typed greeting() below the alert which would once again diplay lilah.

I hope this clarifies it for you and I didn't actually end up making it more confusing lol. Take care.