First off let's clarify manual vs connected account.
A connected account is tied back to a checking or credit account you may have. The connection allows for General Ledger to automatically receive your transaction data. We utilize a 3rd party service, Plaid, for this connection. It is secure, safe, and meets all regulatory requirements.
A manual account is just as it sounds. You must manually add all your transactions into General Ledger. This is typically meant for cash transactions which may not be recorded via your connected credit and checking accounts.