Zero use it and pay in full every single time. If you keep a balance they charge interest and if you owe more than 30% it hurts your credit rating. Interest rates on cards are usually high and can change so never use them to finance something.
Imagine owing $1,000 at 30% interest you are paying $300 a year forever if you don't pay it off. Some owe 30K on credit cards so are paying about 9K a year in interest all so they can have things sooner like furniture. Learn to do without or buy used or accept handme downs.
Getting into debt is easier than getting out of debt.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.