I subscribed to your blog and your newsletter some months ago, and I must say I like what you do. Although I'm focused on C++ now for some courses I'm taking, I still hope to catch up on Go later, and I think your book will be helpful. Personally, I wouldn't mind a hands-on exploration of a programming language having some pages, and links to good resources, on version control. Learning 'git' in such practical way (as part of a project) seems better to me (Harvard's CS50 now takes that approach too: https://github.com/blog/2322-how-cs50-at-harvard-uses-github...).