You can typically get between $30 and $600 from an introductory cashback offer when you meet the spend requirements. For credit cards that offer ongoing cashback, it's usually between 0.5% and 1% of each eligible transaction.
While these are 2 of the most common types of cashback on credit cards, there are sometimes other promotions that could offer different amounts. For example, a card that has personalised cashback offers with retail partners could offer you $10 back when you spend $30 with the retailer.