Tipping culture has become more confusing than ever—this woman is here to clear some things up with her set of rules.

Imagine getting an oil change for your car, and when you pay for it, you are asked if you want to leave a tip. Or how about the cashier at the grocery store or the salesperson at a clothing store?

Your cashier still has to find the bar code ... for restaurant staffers and delivery people, but at most grocery stores, tipping is a no-no. In fact, many grocery store workers aren't allowed ...