Keep in mind though these results are not typical and we probably couldn’t reproduce such extreme results at our grocery stores here in MI. After looking at some forums on details about this store here are some advantages that she has that we don’t:
The grocery store she is at doubles coupons up to $.99
She can use as many coupons as she wants (Meijer’s limits 2 per like item, Kroger 3)
She has multiple coupons for deli items (never seen this! Once in a while but 7!)
She’s already accumlated several “catalina” coupons or coupons good towards your next purchase.
And she doesn’t have to pay sales tax on any food items (other than preprocessed foods) in her state.
So focus on the basics she is teaching and don’t get discouraged if you can’t duplicate her results!

So if some magic storm happened and you actually had a transaction that you had a coupon making everything free, if we spent $200+ in groceries we would still oh $12 in tax.