sorry for asking the same question in a slightly different angle, I want a book in Category Theory similar to Dummit and Foote's book in Abstract Algebra. I want it to have tons of examples and problems, and I want it to be the sort of book in which you always have an idea about what the next results are going to be. Something I really liked about Dummit and Foote is I understood what was going on the first time I read it, but when I read it a second time I felt a lot better than the first time (I'm looking forward to a third).

Sorry if this just sounds like a lost of demands, I just wanted to give some information about what I was looking for.

Thank you kindly

Regards.
['https://math.stackexchange.com/questions/865659', 'https://math.stackexchange.com', 'https://math.stackexchange.com/users/33907/']
I really like "An Introduction to the Theory of Numbers" by Niven, Zuckerman and Montgomery. Great collection of problems too.
I'm enjoying this library book, Introduction to Number Theory by Daniel E. Flath. Pretty similar topics to the type of answers I generally give on MSE. It really is pretty basic, but I do think a semester of abstract algebra (groups, rings, fields) and one of linear algebra/matrix theory would help. I ordered a used copy online for myself, inexpensive.