When I was researching Office 365 Groups, I had difficulty finding useful information since neither groups nor Office 365 is something new.
Then I came across the digital book, Office 365 for IT Pros, which is updated every week.
The authors did a great job reflecting on each possible approach and putting them in context.
I thought this was a great source of information and wondered if there were any areas where I could contribute and found that the there was not much content on Skype for Business Online, which is one of my primary areas of expertise.
I asked the authors, Tony Redmond, Michael Van Horenbeeck and Paul Cunningham, if they wanted help in that area and I ended up writing a dedicated chapter that I keep up to date as well as help keep the rest of the content up to date.