May I suggest beginning with the ecumenical creeds?
[Apostles' Creed](https://www.ccel.org/creeds/apostles.creed.html)
[Nicene Creed](https://www.ccel.org/creeds/nicene.creed.html)
This is how our fathers and brothers in the faith articulated the teaching of Scripture--what we believe, and what we do not, from time immemorial.
🤙