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There's also a rather nice chapter in "The Heart of Cohomology" by Goro Kato. It could however be argued that I'm biased since I'm the one who typeset the book :)

Another good starting point is Timothy Chow's "http://www.ams.org/notices/200601/fea-chow.pdf". http://www.ams.org/notices/200601/fea-chow.pdf".

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There's also a rather nice chapter in "The Heart of Cohomology" by Goro Kato. It could however be argued that I'm biased since I'm the one who typeset the book :)

Another good starting point is Timothy Chow's "http://www.ams.org/notices/200601/fea-chow.pdf".