How can I use the free coupon code of Casinos?

[Sike_lottery]

I have seen several Casinos giving free coupon code . For so many things in the casinos, the coupon code would be useful for betting and for the benefit of the users. I am also trying as much as possible to understand the usefulness of the coupons code that is seen in most of the casinos and the way it could be useful by the users of the platforms.