Reddit reviews Modular Functions and Dirichlet Series in Number Theory (Graduate Texts in Mathematics (41))
We found 3 Reddit comments about Modular Functions and Dirichlet Series in Number Theory (Graduate Texts in Mathematics (41)). Here are the top ones, ranked by their Reddit score.
I'm no expert either, but I highly recommend Apostol's Modular Functions and Dirichlet Series in Number Theory. It can be read after a first complex analysis course and gives a thorough background to the j-function in the first four chapters. There's nothing on moonshine, but the connections between modular functions and number theory begin here.
His number theory books, Introduction to Analytic Number Theory and Modular Forms and Dirichlet Series in Number Theory, are some of the best in their respective subjects. Good to learn from and good for references.
Assuming you liked Apostol's intro, he wrote another text which is almost like a second volume: https://www.amazon.com/dp/0387971270/?tag=stackoverfl08-20