Which of the following is a strategy for using credit wisely while improving your credit score

for example if you wanted to buy a car but had bad credit most of the time you wouldn't be able to apply for a car loan from a bank. To get better your credit you could spend small amounts on a credit card then pay ahead of time or on time when you pay your bill for the credit card. Like buying packs of gum and small things then paying them off will make your credit grow more.