Pay off your credit card bills each month, or don't use them.
This has been a nagging thing for me.
Went years and years not wanting a credit card. Don't want to buy anything I can just pay for up front.
But your credit score is crap doing that. Fun. I think they should honestly change that. If you make it to the age of 30, living independently since college without needing a credit card, your credit score should be good.
Anyway, I get one, pay it as soon as I used it, no problem, just an extra step. Whatever.
Then I read you should have 2-3 credit cards to help your credit score. So I do that, no problem, continue on.
But it one spring, I just got in the habit of using them for everything - didn't need to, just happened to - and racking up a bunch of bills.
Been paying them off for 2 years. Nearly finished, but damn. One 2-month period of drifting off mentally about it and BOOM. It's stupid.