Not saying it's better or worse, but I'm willing to say that the understanding you'll get from blogs is going to be be different than from a long-form book.
Books get the benefit of knowing where they left off one chapter, and picking it up on the next. Unless you're reading a long series of posts on the same blog (which, in the limit, approaches reading a book), reading blog posts will lack that continuity, and I find them inferior for building up a basic understanding of a topic. What blogs do really well, IMO, is for teaching you well-isolated techniques, or other such limited-scope ideas.
Your experience with C++ And Golang are in no way, shape or form comparable. If you've been doing C++ for 15 years, Golang is a comparatively small learning curve. You just need to pick up on a few syntactic differences and you'll be at that basic level of competence that books will give you, and you're ready for the single-topic, specialized learning that you'll get from blogs.