The next step up from a checkbook journal, is a journal that keeps track of all your accounts, not just checking. In such a journal, you record not only who gets paid—in the case of a debit—but where the money came from. In a checkbook journal, it’s assumed that all the money comes from your checking account. But in a general journal, you write postings in two lines: the source account and target account. There must always be a debit from at least one account for every credit made to another account. This is what is meant by “double-entry” accounting: the journal must always balance to zero, with an equal number of debits and credits.