I am not understanding the difference between the idle cash, cash and super cash?

Thanks for checking our guide! Simply put;

Cash: The resource you collect on the first continent (shown as the gold coin) which is the primary currency that enables you to unlock other areas in the game.

Idle Cash: The rate of how fast you earn and equivalent amount of “Cash” currency in the game (per period of time), while it is closed (meaning you are not actively playing it). Basically, what you earn here (when the game tells you that you earned an "X" amount while you were gone) adds up to your Cash inventory.

Super Cash: The one identified by the green bill icon -- which acts basically as the premium currency in this game. Super Cash enables you to purchase boosts that can ultimately help you progress faster in the game.