Check out these resources on how to build credit from the three main credit bureaus
Experian: https://www.experian.com/blogs/ask-experian/credit-education/improving-credit/building-credit/
TransUnion: https://www.transunion.com/article/how-to-build-credit-health-fast
Equifax: https://www.equifax.com/personal/education/credit/score/