Some suggestions on reading up on a few things… The works herein listed regarding the Orthodox Church are given because it is same faith professed by Eastern Christians.
Andrew Louth, Introducing Eastern Orthodox Theology, IVP Academic (October 11, 2013).
John Anthony McGuckin, The Eastern Orthodox Church: A New History, Yale University Press (March 17, 2020).
Eastern Christians and Their Churches by Fr. Steven Hawkes-Teeples, S.J., is a very fine and brief introduction taking the reader through the various liturgical traditions that constitute the Christian East. This is a must read. Fr. Hawkes-Teeples is a former professor at the Pontifical Oriental Institute (Rome) and the author of several works. While he is a Jesuit priest he also serves in a Byzantine Catholic parish in St. Louis, MO.
Timothy (Kallistos) Ware, The Orthodox Church: An Introduction to Eastern Christianity, Penguin Books, Penguin Books; 3rd Revised edition (October 6, 2015).
Joseph Raya, Byzantine Church and Culture, Madonna House Publishing (January 1, 1992).
Joseph Raya, Abundance of Love: The Incarnation and Byzantine Tradition, Madonna House Publishing; Third edition edition (August 15, 2016).
Church Fathers and Mothers
Mike Aquilina and Christopher Bailey, Mothers of the Church: The Witness of Early Christian Women, Our Sunday Visitor (March 8, 2012).
Mike Aquilina, The Church Fathers, Our Sunday Visitor; 3rd Edition edition (March 31, 2013).
Mike Aquilina, The Witness of Early Christian Women: Mothers of the Church, Our Sunday Visitor (September 28, 2014).