Difference between gstr 2 and gstr 2a

GSTR 2A is auto populated by the system which will take in to consideration of invoices uploaded by your supplier. U have just check the details of 2A and ensure all are correct.

Then go to GSTR2 and click prepare GSTR2 summary and the system will bring all 2A invoices to GSTR2

after check for its correctness you can file GSTR2