Stacking coupons is a pretty easy concept once you know the basics. You can use 1 manufacturer coupon and 1 in-ad (store) coupon per item.
You can read about the difference between kinds of coupons here.
Some stores or coupons themselves (in the fine print) will limit how many coupons you can use per transaction. I usually break things up into multiple transactions if that is the case. When you match your coupon savings to the current sales prices, you can save anywhere from 40-100% on some items - that's right, I quite often get things free!
This is easy, let me show you the steps:
1. Have your stack of coupons/inserts on hand.
You can read about where to find coupons here.
2. Have your weekly sales ads on hand...sometimes they have in-store coupons!
4. Go shopping, save big, get things Free! It really is that easy!