This video series (there are 8 videos) is one of the best explanations, * https://www.youtube.com/watch?v=O5iRJ_cwpIk

• https://www.stbasilbyz.com/byzantine-history.html
• https://en.wikipedia.org/wiki/Patriarchate
• https://en.m.wikipedia.org/wiki/Theosis_(Eastern_Christian_theology)
• https://en.wikipedia.org/wiki/Byzantine_Rite
• https://www.saintgeorgeonline.org/_files/ugd/6b0610_39251b1ccc84420d81d22cd46ffbd9bc.pdf
• https://www.saintgeorgeonline.org/_files/ugd/6b0610_41025a973f2c4d93a86e8c5f846f4d5b.pdf

Books:

• The Orthodox Church, by Metropolitan Kalistos (Ware)
• The Orthodox Way, by Metropolitan Kalistos (Ware)
• The Spirituality of The Christian East: A Systematic Handbook, by Tomas Spidlak
• Prayer: The Spirituality of The Christian East Vol. II, by Tomas Spidlak