2.4-2.4.1, due on September 7

I'm still having a difficult time with the different language that this book uses compared with the one that we used for Abstract Algebra. I also feel like this book is less particular about things which has, so far, only confused me. Aside from that, it is interesting to look at congruence classes again and hopefully I'll quickly remember what I learned so that I can enjoy it again. I'm not sure if I quite understand what they mean by residue classes, sets of residue classes, complete residue systems...is this just different vocabulary for something we've already learned?