Explores various Trinitarian heresies, both historical and modern, that misinterpret the Christian doctrine of God existing as three distinct persons (Father, Son, and Holy Spirit) in one divine essence. The article identifies and refutes errors such as Modalism (God as one person in different roles), Arianism (the Son as a created being), Tritheism (three separate gods), Subordinationism (unequal divine persons), and Partialism (God as divided into parts). It emphasizes why these misunderstandings are problematic, often linking them to contemporary religious groups.