Real fluid mechanics is very complicated, not only high numbers, but also higher algebra (linear algebra), tensor analysis, field theory, complex variable functions, differential equations (especially partial differentiation) and so on. After understanding these foundations, we can't solve the problems of fluid mechanics, because most differential equations have no analytical solutions, so we need a lot of mathematical foundations to learn finite element theory with the help of computers. . . . .
This is engineering fluid mechanics, and more is a simplified model or empirical formula. Ready-made formulas can be directly applied, but the scope of application is very narrow, so we must pay attention to the scope of application. As for the high number, it may be helpful to you when you look at the derivation, but it is of little significance; Some topics may require some knowledge of integration and simple knowledge of ordinary differential equations.