Mike Reynalds (aka Sitecore Junkie) is the creator of Sitecorejunkie.com. He's been a Sitecore MVP for multiple years now. On his blog, he dives deep into Sitecore topics. His blog posts are very humorous and technical. Beware, if you are not technical it will be difficult to follow along with his articles. I've had the pleasure of working with Mike in the past and he knows his stuff. Anytime a difficult problem came up he knew exactly where and how to fix it. You can commonly find Mike in the Sitecore Slack group answering questions and moderating the group. He is also on Twitter @mike_i_reynolds.