credit cards

I use my credit card like a debit card and earned $600 in rewards in
2024. I think this is ‘free money’ but my friends tell me it’s not. So
what are the drawbacks?

I use my credit card like a debit card and earned $600 in rewards in 2024. I think this is ‘free money’ but my friends tell me it’s not. So what are the drawbacks?