Hi there leokong18,
Thanks for reaching out about your bank accounts. QuickBooks Online is a great tool able to assist in keeping track of sales and expenses so you know the profitability of your business. I can point you in the right direction for assistance with bank connections.
If you're seeing an error message when trying to update transactions, you can follow the steps outlined in this article. There are steps for all errors in general, as well as links towards steps for specific error numbers shown within error messages. You can also check the bank feed status page to see if the error message shown is a known issue with your bank.
If you have any other questions, or need further assistance, feel free to reach out here.
