These are the terms every other accounting conversation depends on. If a bookkeeper is reviewing a messy QuickBooks file, the first question is not "which app did this come from?" It is whether the general ledger, double-entry logic, and trial balance still tell the same story.
Start with the general ledger. It is the record every P&L, balance sheet, customer report, and bank rec pulls from. Then check : every transaction has two sides, and the accounting equation only holds when debits and credits stay paired. The is the monthly proof that the ledger still balances before the close gets handed to an owner, advisor, or tax preparer.