Oh lord well don’t CARRY a balance and pay interest just use the card for everything you don’t mind being tracked about and pay it off every month. This way you keep an average monthly balance but you don’t pay interest. You also can earn points with a good card most of my kids Xmas gifts come from points I save up all year just paying my regular bills.
If your nut is very tiny this won’t be much but I keep car payments, insurance payments, phone bill, every monthly bill I can on a card and pay it off every month before any interest accrues. if you’re lucky you can put rent on there. I don’t know what the exact percentages are sorry just have been gaming credit cards for years and know the score is highest if you keep them in use.