To record your expenses, incomes and other money operations please use transactions (see the section called Transactions in Chapter 3).
Use limits ( the section called Limits in Chapter 3) to browse through your transactions and for analisys purposes.
To ease entering of periodic transactions use scheduled transactions (see the section called Scheduled transactions in Chapter 3).
Try clicking titles of columns in the transactions list. This will sort the list (clicking twice reverses order).
For advanced analysis of accounts and transactions use reports (see the section called Reports in Chapter 3).