I don't know if it works differently in the US but the best way to build your credit score is to not take on debt.
Keeping your credit utilization low and not missing any payments is the key. It's an indication of how likely you are to meet the payments.
If you max your credit cards out and just pay the minimum amount, carrying thousands of dollars of debt and as a result can't get a mortgage or a car loan because your credit score is shit then the system is working as expected.
I don't know if it works differently in the US but the best way to build your credit score is to not take on debt.
Keeping your credit utilization low and not missing any payments is the key. It's an indication of how likely you are to meet the payments.
If you max your credit cards out and just pay the minimum amount, carrying thousands of dollars of debt and as a result can't get a mortgage or a car loan because your credit score is shit then the system is working as expected.