Board Thread:Questions and Answers/@comment-32000373-20170513192346/@comment-1038387-20170513200529

If you read the main Justice League archs - Origin, Throne of Atlantis, Forever Evil, Darkseid War - you'll get the gist of it. They're not the best, but they're the most accessible. A lot of it is much better, but not necessary to get up to date.