Question

A way to build good credit is

using only secured loans.
taking out many lines of credit.
paying bills when they are due.
using only credit cards.

Answer 1

Paying bills when they are due.

Timely payment history is the most important factor in credit scores; the other options (only secured loans, many lines of credit, or using only credit cards) are not reliable ways to build good credit and can sometimes hurt your score.