What is a reference for the subject of "free resolutions for Lie algebras"?


Does the term "standard resolutions" means "free resolutions"?


What is a "bar resolution"?


Is there only one way to talk about this or it is always by considering the Lie algebra as a module over its universal enveloping algebra?


These questions arose when I was reading some papers by K. S. Brown



Free resolution for Lie algebras (reference)
Here are some references (which are not mentioned in [Resolutions of Lie algebras](https://mathoverflow.net/questions/130376/resolutions-of-lie-algebras)).


First I can recommend the book of Charles A. Weibel, An Introduction to Homological Algebra.
It answers your questions and has a chapter where the general theory is made explicit for
Lie algebras.


Secondly, the book of A. W. Knapp on Lie groups, Lie algebras and cohomology.
This has many details and many examples.


