Book/website for an introduction to modular arithmetic

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Some questions here are answered exclusively by using modular arithmetic. Especially those involving number theory. Suggest some books or websites where I can learn enough modular arithmetic so as to solve/understand solutions of these questions on number theory.

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I have the book "An Adventurer's Guide to Number Theory" by Richard Friedberg. It deals mostly with basics. One chapter is about modular arithmetic. It contains a lot of examples.