In which tax head i have to pay tax

1) Place of supply of SERVICES: In this case, it would be the place where the services are actually provided (for example, in case of hotels, place of supply is the location where the hotel is situated). So you are required to charge CGST+SGST in this case.

2) Place of supply of GOODS: If you are delivering goods to a place intrastate against an order from a client interstate, then you are required to charge IGST. In this case, on the invoice, mention the name of buyer as well as that of the consignee.