The linked post is about a new book by Jeremy Wagner, but I just wanted to highlight the excellent aside on book writing by Chris Coyier near the end:
Write a blog post first, or maybe a whole bunch of blog posts. That’ll prove you clearly have words to say about this. Plus it will get the energy of your idea into the world. You might get feedback and constructive insights on the idea as it is shared. Then, hopefully, you can turn that blog post into a talk. That’ll really get you thinking deeply about your idea while getting even more comfortable with the idea of sharing it clearly. And, if all goes well, turn all of that into a book!
Looks like Jeremy did just that.