The left and right sides of the transaction show information such as the cause and effect of the transaction, the purpose of use, and the final status, depending on which accounts are selected. In accounting, it should be considered exactly like the eight elements of a transaction, but in whooing it is not necessary to do so.
As a rule of thumb, you can choose one from the left and one from the right. When selecting, look at the + /-signs attached to the right of each item name. Each symbol indicates an increase or decrease in money for that item. In other words, if you select'Cash +'and'Kookmin Bank-' respectively, it is a record that money was lost from Kookmin Bank and went into cash.
Examples are summarized in [Types of Frequent Transactions] (/help/entries/insert-example/frequently-types). Except in special cases, most of the daily transactions only appear.