Hi
Is asserting a circuit the same thing as as making it active high? I know that active high refers to when the input Is 1 or high but how does that relate to asserting the input, such as a pushbutton?
Not necessarily.
"Asserting" a signal usually means "making it active". A signal can be active high (positive logic) or active low (negative logic). Asserting the signal means "making it high" for positive logic or "making it low" for negative logic.