Credit score

I’m 20 with a 759 credit score, I’m looking into buying my first home within the next year. I had 3 lines open but I paid my car loan off so now I have 2 credit lines open currently how does one raise her credit score? Is it good to pay your credit cards off completely every month? I’ve heard it’s good to pay if off 100% but then I’ve heard to have like $1.00-$2.00 roll over the next month? Is that accurate or good for your credit score? Any advice anyone could give to a 20 year old? ☺️