Some credit cards, such as retail ones, have negative points compared to other credit cards, like bank ones. Try not to max out, keep the balance low, try to get multiple sources of credits (not too many) but within controllable, e.g. not just getting credit cards but credit cards, loans, line of credits, etc. Be sure they are manageable otherwise you will be in trouble. Don't apply loans in the short time frame. There are many ways to build credit or lower the credit. Credit score considers numerous factors. Don't be late in paying on credit cards, loans, etc. It is more important than paying on time on mortgage, in terms of credit score.