Create a small hledger journal with income, expenses, a transfer, and a correction. Run balance and register reports, then compare them with your bank statement. If you import transactions, inspect how duplicates are detected and how the resulting entries are reviewed.
Plain-text accounting rewards consistent conventions. Decide how to name accounts, handle currencies, and review changes in version control before migrating years of data. Keep source statements and a restore path; the journal should remain understandable to someone other than its author.