  Let $k$ be a differential field of characteristic zero with an algebraically
closed field of constants. In this article, we provide a classification of
first order differential equations over $k$ and study the algebraic dependence
of solutions of a given first order differential equation. Our results
generalize parts of the work of Noordman et al. (MR4378074) and complements the
work of Freitag et al. (MR4506775).
