Deposited a personal cheque by mistake into business account, how do I deal with this in quickbooks? As I need to reconcile.

Thanks for getting back to us, PJM2. For the purposes of reconciliation, you can create a dummy personal bank account in QuickBooks to transfer the funds from and to. To do this, click the Cog > Chart of accounts > New > Set the Account type to Cash at bank and in hand > Select your preferred detail type > Rename. 

After this, go to your Banking in QuickBooks and select your Business account - click onto the transaction in the for-review tab to review this and select Record as transfer > Select the personal account under *Transferred from. 

When you come to transfer this, create a manual transfer (+ New > Transfer) with the business account entered under Transfer Funds From and the personal account entered under Transfer Funds To. Check that the date and amount are correct and then save & close. The balance of the dummy personal account will now be 0.00 and can be made inactive from the chart of accounts.