Create a new file in the _books folder with your book title as the filename and ending in the extension .md (use hyphens instead of spaces).
Copy the following code and paste it into your file:
---
author-name: "Your Full Name"
author-name-short: "Your First Name"
author-website: "https://mywebsite.com"
author-twitter: "twitterhandle"
book-title: "My Book Title"
book-slug: "your-book-title"
book-url: "https://mywebsite.com/where-you-can-buy-my-book"
---
The book blub goes here, and the format is Markdown.
Edit the contents.
Check to ensure there is a book image in the images directory with the filename book-slug_medium.jpg. Otherwise, we can help update the image for you, or you can add a new image following that filename structure.
Commit the changes.
You can add additional author names and Twitter handles:
author-name: "First Author and Second Author"
author-name-short: "First"
author-name-short2: "Second"
author-twitter: "firsttwitter"
author-twitter2: "secondtwitter"
You can add one additional line:
free: true
This will change the button text to say "Read [Bookname]" instead of "Buy [Bookname]".