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Other Questions
I've got you, @KA2022. I'll explain and give solutions to all of your concerns in QuickBooks.
I’ll ensure that my response will help you understand what’s going on in your QuickBooks Online.
When you say not linked to bank feed, do you mean the transactions are no longer syncing in QuickBooks? If this is the case, I recommend that you click the Update button on the Banking page to refresh the connection. See the sample screenshot below for your reference:
If the issue persists, you have the option to import the data manually. This way, you can categorise your transactions without any delay. Follow the steps below: 
- Sign in to your bank website and follow the instructions to download your transactions as a comma-separated value (CSV) file.
 - Go to the Banking tab on the left side.
 - Click the Link account drop-down and choose Upload from file.
 - Tap Browse and pick the data.
 
5. Review all the fields, then tap Next.
        6. Click Let's go to complete the process.
 
But if you mean the bank account is disconnected, you might want to reconnect it. This way, you can manage your transactions accordingly.
For your second question, if these expenses are on the For review page, I'd advise matching the transactions to tag them as closed. After categorizing, you can see these expenses in the Chart of accounts. For more knowledge, click this link: Categorise and match online bank transactions in QuickBooks Online
For the duplicates, I'd suggest excluding them. All excluded transactions will not appear in any account registers or financial reports.
Here's how:
- Go to the Banking tab on the upper left side.
 - Select the For review tab.
 - Check all the duplicates transactions and choose Exclude.
 - Click OK to confirm. 
 
For your last concern, if your QuickBooks is connected to the online banking function, you can categorise your third-party money right away on the For Review.
Once everything is good, don't forget to reconcile them to make sure they match your bank and credit card statements.
Moreover, check out these articles below on how to fix reconciliation and bank issues in QuickBooks:
- Fix issues the first time you reconcile an account in QuickBooks Online
 - Open Banking connection errors
 
Drop a line if you have follow-up questions about your bank feeds. I'm happy to answer all of your questions. Keep safe, KA2022.