Depends on your department and if they cross-train you. There is Cash (fairly self explanatory), softgoods (clothing), hardgoods (sports equipment), footwear, atmosphere (sometimes), and DOM (fulfilling online orders). You help customers and maintain the store in the majority of those departments besides DOM. None are very complicated though if you have some prior knowledge on what you're selling in your department.
Cashier do strictly cashiering
and and tag clothing rules may have changed
Serve customers and maintain the store
For clothing, you'll mostly be cleaning and organizing your department and help customers
Allot of customer service much more than what u would expect. Allot of dusting. Other than that regular retail stuff.