re: Best Credit Card for mid-20 year old

Discover is an easy to use beginner card with 2x cashback your first year. I'd recommend the Chase Sapphire which has an all time-high sign up bonus now and if you'll be able to have a large amount of spend through rent you'll be traveling free for a long time. Great earning rate and easy to use points system for travel or statement credits, but the promo sign up bonus will be ending any day now. Chase Freedom is a great no annual fee option as well if the annual fee scares you (even though the signup bonus is 10x the value of the fee). Amex is good overall, but I find it's too difficult to redeem points for good value for beginners.