There may be a few unfamiliar terms when you start couponing. Here's some words/lingo that I had to figure out, that might be helpful to know:
BOGO: Buy One Get One. Can be followed by "free," "50% off," etc, but usually if you just see "BOGO" it will mean Buy one Get one Free.
Catalina: a voucher for money off a future transaction, printed at the register. It is usually a reward for buying a certain item. Catalinas often are not highly advertised, but when you can find them, they can end up being really hot deals--especially if the item is on sale or you already have a coupon. This is the way a lot of people "make" money off of a purchase--they drive the price very low with coupons or sales and then get catalinas after to boot. Catalinas can be used like gift certificates at the store they were printed at. Do be cautious to read the fine print though--sometimes they have stipulations that you need to be aware of.
Moneymaker: Just like it sounds, an item that will actually earn you money when purchased. Depending on the store's coupon policy, they'll either give you an item up to free, or they will actually give you a the difference earned. For example: a bottle of body wash comes on sale for $2.49. You have a coupon for $3 off 1. If your store allows it, you may actually earn $.51 per bottle purchased, or you may just get the item for free. Another great way to find moneymakers are with mail-in rebates or catalinas.