The new textbook on complex analysis, structured in line with the classic work of Lars Ahlfors, is designed as a companion text for a one-semester introductory course. Additionally, the author addresses some advanced topics. The volume includes numerous exercises as well as three chapters in the appendix on the concept of connectivity, compact metric spaces, and harmonic functions. The author places particular emphasis on presenting all proofs elegantly and completely. The book is also suitable for self-study.