The amount of credit that you need is just that. It’s the amount of credit that you personally feel that you need. The amount is not the same for everyone as every person’s financial goals and plans are different. For instance, if you only intend to use credit as a more secure form of payment (versus debit) and intend to pay off your credit card debts each month, you would likely need just enough credit to cover the expenses that you plan on paying for with credit.
If you prefer to have credit readily available for financial emergencies, you would want to secure that amount of credit. If you haven’t created a budget and determined how much you would need in the event of an emergency, now’s a great time to do so.