TITLE: Lie algebra and Lie group cohomology, reference request
QUESTION [5 upvotes]: Who can give me a good reference (better if introductory/motivated) about Lie group cohomology, Lie algebra cohomology, and the link between the two?
Thanks.

REPLY [3 votes]: I have used the book Lie Groups, Lie Algebras, and Cohomology by Anthony W. Knapp. It has many examples and is very detailed. It may be a good start for you.