Hi there avidankit-outloo,
It's important that you have the correct software to be able to help with your client's books. QuickBooks Online Accountant is a great tool you can use to remotely connect to your client's QuickBooks Online accounts so you can help manage their books. I can provide some information about QuickBooks Online Accountant.
QuickBooks Online Accountant is a free software for accountants to use to connect with their clients' books. You can sign up using the sign-up button located on this page.
If you have any other questions, feel free to reach out here.