In general, what are the different types of changes or corrections that I can make in Form 24Q?

Here are the corrections that you can make in Form 24Q: 

1. 1. Update deductor details such as Name, Address of Deductor.
   2. Update challan details such as challan serial no, BSR code, Challan tender date, Challan amounts. 
   3. Update/delete/add deductee details.
   4. Add/delete salary detail records.
   5. Update PAN of the deductee or employee in deductee/salary details.
   6. Add a new challan and underlying deductees.