Started a new job and feel really bad?

Did they give you any training to start with. unfortunately, it happens to everyone but next time be extra careful. Don't be in a hurry and take your time counting money. If you receive large bills, when returning change count it in front of the customers. Don't mix your bills in the til, keep the 20s, 10s. 5s. singles and the change separate throughout the day and keep larger bills under the til. When exchanging money with managers or other workers be careful and count. With new notes, make sure they are not stuck together and if need keep a wet sponge or something else near by to help. Over all just be careful taking money and giving money back. Don't be in a rush.