Hi shay_prajapat,
Welcome to Community! It's important that yo you opening balances are accurate in QuickBooks Online to ensure a you have a true picture of your finances when running reports. I'd be happy to provide more information so you can get back to what you love!
In QuickBooks Online, you can enter the balance of your real-life bank account for a specific day to start tracking your transactions. This can be done seamlessly whether you've connected your bank and credit card accounts to online banking, or haven't yet done so. Here's a helpful guide to assist you with both scenarios.
Please don't hesitate to reach back out with other questions. We'd be glad to assist!