Difficult: It was a little hard at first to wrap my mind around the concept of congruence, even though I've studied them before. I have to think hard to be able to understand what the examples mean and what congruence modulo n means, but I think this will get easier after practice.
Reflective: I remember learning about congruence in Math 290. I think it's really interesting that congruence modulo n has similar properties to the relation of equality. Also, I think Corollary 2.5 Part 1 is interesting, that [a] = [r], with r being the remainder when a is divided by n.
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