The book’s website[6] has links to submit errata for the book as well as the source code for the sites you’ll build in this book. The downloadable source code is there as a reference and contains the site as it exists at the end of each chapter.
https://gohugo.io
https://jekyllrb.com/
https://www.gatsbyjs.org/
https://www.netlify.com/
https://nodejs.org
http://pragprog.com/book/bhhugo