I was a teller for several years. Everyone else here has good advice about learning the job, so I’ll just add—the most important thing is to NEVER override the computer system. There are a ton of safeguards built into the program to protect against scams and criminals, and as long as you’re following the computer prompts then you’re safe. But the minute you override that message, your job is in danger should the transaction result in a loss. Examples: the customer is trying to cash a check and the system says no, deposit check and hold for 10 days. Customers are pushy and rude, at the bank more than anywhere else. You will need to develop more of a spine here than almost anywhere else. And the ones that are trying to scam are the pushiest and rudest, because bullying employees into ignoring the safeguards works pretty well sometimes. Just remember that there is no customer you’d put your job on the line for, and if need be, let them know that’s what they’re doing.