"stay away from credit cards"
I followed this advice in my youth. Never applied for a credit card, never took out a loan, never bought anything I couldn't afford to drop cash on. I thought it would show I'm fiscally responsible because I'm not accruing debt.
Then I got an opportunity to work a govt job providing communications for the White House; basically, following the president around and ensuring he's able to communicate at press events, etc. I applied for the job and was told I was their #1 candidate...
...But they ran a credit check on me and was surprised when they got zero results. I proudly stated that I've never been in debt before, so my credit risk is zero. But according to them, zero credit history is shady as fuck. They said they couldn't tell how well I manage money because there's no history showing regular, on-time payments on credit cards, loans, etc.
They couldn't tell if I had trouble managing money or not. That made me a potential bribe risk. Someone could offer me tons of money to slip a bomb into the president's podium, or let a suspicious character into the White House, and if I'm hurting enough for money, they suspect I might be willing to do it.
Literally, my entire history of service in the govt had no bearing on my loyalty. Only my credit score. I lost that job opportunity because I was fiscally responsible.
I went out and got a credit card that same day. I now have an extremely high credit score, which I keep up by paying all my bills and utilities on credit, then paying off almost all of it at the end of the month. I think it's stupid that I need to put myself in debt, then pay my way out of it over time, spending even more money in the long run, just to prove I'm fiscally responsible. That should prove that I suck at managing money, not the other way around. But that's the broken system we have today.