Which credit cards are to be the best for low income person, between 25000-30000 per month?

Yes, there are some cards which fit your criteria. They are mentioned as below.

SBI FBB StyleUp card:

2.5% cashback on grocery spends at big bazaar

10% discount on fashion at FBB
Rs. 500 joining gift voucher from FBB

2.5% cashback on restaurant spends

SBI SimplyClick Card:

1.25% cashback on online spends

2.5% on amazon, ola, lenskart etc

Rs. 500 amazon gift voucher

Rs. 4000 amazon gift voucher on reaching thresholds

Plus to enjoy more cash backs search for klippd on google