What did the recent study using the CRISPR gene editing technique actually entail, and what did we learn from it?

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Sources:

https://www.nature.com/nature/journal/vaop/ncurrent/pdf/nature23305.pdf
https://www.nature.com/nature/journal/vaop/ncurrent/full/nature23533.html
http://www.nature.com/news/crispr-fixes-disease-gene-in-viable-human-embryos-1.22382
https://www.clinicaltrials.gov/ct2/show/NCT02793856?term=NCT02793856&rank=1
https://www.wired.com/story/first-us-crispr-edited-embryos-suggest-superbabies-wont-come-easy/
http://www.mayoclinic.org/diseases-conditions/hypertrophic-cardiomyopathy/home/ovc-20122102
http://www.nature.com/news/first-crispr-clinical-trial-gets-green-light-from-us-panel-1.20137
https://www.newscientist.com/article/2133095-boom-in-human-gene-editing-as-20-crispr-trials-gear-up/
http://www.heart.org/HEARTORG/Conditions/More/Cardiomyopathy/Hypertrophic-Cardiomyopathy_UCM_444317_Article.jsp#.WYj4rojyuM8

Images:

https://en.wikipedia.org/wiki/File:Crispr.png