"Complex Analysis" is another comprehensive textbook of more than 470 pages on the foundations of complex analysis, intended for undergraduate students in mathematics, physics, and engineering.
It covers complex numbers and functions, analytic and harmonic functions, contour integration, Taylor and Laurent series, residue theory, conformal mappings, Fourier series, and Fourier and Laplace transforms, together with many examples, applications, and exercises.
The book begins with introductory material and gradually progresses toward more advanced concepts. It requires some prior knowledge of calculus, particularly multivariable calculus, but the explanations are clear and carefully structured.
I recommend saving it as a reference because it is very well written and freely available as an open-source textbook.
complexanalysis.org/howell-c…