1. Initial setup or cleanup. A Live bookkeeper reviews your existing QuickBooks file, or helps set up a new one, fixing miscategorized transactions and getting your chart of accounts in reasonable shape before ongoing work starts.
2. Ongoing monthly categorization. Transactions coming in through your bank feed get reviewed and categorized by the bookkeeper rather than you doing it yourself, though you can usually still weigh in through messaging inside QuickBooks.
3. Monthly reconciliation. The bookkeeper reconciles your bank and credit card accounts against your statements each month, the same Reconcile process covered on this site's reconciliation guide, just done by someone else.
4. Reports and check-ins. You get standard financial reports (profit and loss, balance sheet) and some level of access to the bookkeeper to ask questions, with the exact depth of involvement depending on which Live tier you're on.