Reference request: Introduction to Finite Group Cohomology
Solution 1:
For many reasons, I would suggest Weibel's "Intro to Homological Algebra", because it puts things like "group cohomology" into a somewhat larger context, enabling comparisons to other things... Perhaps no reason to be a complete slave to the ordering of topics therein... but to see that "group cohomology" consists of the right-derived functors of the "fixed-vector" functor (and "group homology" of left-derived functors of "co-fixed-vector" functor), as an example comparable to Lie-algebra (co-) homology, and many others, makes it easier to understand each particular example.