Hello @sermin-vanderbil,
Let me share some information about the access of your account into your online account or company.
To start with, giving them the access is safe as long as you won't transfer the Master Admin role to them. Doing your still in control of your account and they can only do tasks related to accounting.
To learn more about the access of your accountant, here's a link you can visit for reference: Add an accountant to review your accounting in QuickBooks Online.
Lastly, I've got you this helpful article in case you're in need to invite other users and the task they can do with the access given to them:
Stay safe and comment below or post again if you have any other questions. I'll be here to lend a hand.
