5. Check and double check your statement
It is not uncommon for credit card statements to have erroneous transactions. Sometimes, a purchase could have been billed twice on your credit card and you will never find out unless you physically inspect your credit card statement.
Moreover, if you use your credit card for recurring payments, especially for online facilitated services, you can quickly forget what charges accrue on your credit card statement every month.
Taking a monthly look at your credit card statement will allow you to stay on top of your expenses and also help you quickly investigate purchases or charges that might have been added to your account.