Some topics/concepts which might interest you; links are to articles from the 1913 Catholic Encyclopedia, which is generally a solid resource for exploring Christian theology and religion, albeit from a thoroughly Roman Catholic perspective:

Hypostatic Union: https://www.newadvent.org/cathen/07610b.htm

The Incarnation: https://www.newadvent.org/cathen/07706b.htm

Communicatio Idiomatum: https://www.newadvent.org/cathen/04169a.htm