If I link my bank account does all ny money go here or can I still use my account

Thank you for posting here in the Community, sallyevans1987-g. 

 If you link your bank account to QuickBooks Online, only the transactions can be downloaded not the actual money. However, the actual balance will still reflect in your account.

You can read through this article in the future for the detailed steps on how to connect and add bank accounts to QuickBooks Online. 

Let me know how this goes by leaving a comment below. I'm always glad to help if there's anything else you need with connecting your bank.